Canine genetics papers often contain a reference to Charles
Darwin, usually to On the Origin of
Species, where he said that it is “almost certain that our dogs are
descended from several wild stocks.”
This conclusion remained possible until put to rest by modern genome
research. (E.g., Ostrander and Wayne,
2005; Larson, Karlsson, Perri, et al., 2012)
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Wolf in London Zoological Gardens (Stonehenge, 1859) |
It is a testament to Darwin's authority that, a
century and a half after his major work, his views must be acknowledged even
when not borne out by research, and time must be taken to explain how
he got it wrong. His opinion that dogs
descended from more than one species of wild canid had a great deal of longevity,
and though Konrad Lorenz rejected the idea before genome results nailed its
coffin shut, at the time he wrote Man
Meets Dog in 1949, Lorenz was still in agreement with Darwin that jackals were
part of the history of dogs.
Darwin was an acute observer of animals and wrote
extensively about dogs beginning with his time on the Beagle in the 1830s until
he put down his pen, in both books and
correspondence, and it is perhaps worth the time to review what he said
about dogs for much of it remains true and some perhaps has still to be adequately
considered.
Origins of the
Domesticated Dog
Having already mentioned Darwin’s belief that dogs came from
several wild canid stocks, it will be easiest to begin with this issue. Perhaps his most comprehensive statement
concerning dog origins was provided in The
Variation of Animals and Plants under Domestication, published in 1868,
where Darwin said:
“[I]t is highly probable that the domestic dogs of the world
are descended from two well-defined species of wolf (viz. C. lupus and C. latrans),
and from two or three other doubtful species (namely, the European, Indian, and
North African wolves); from at least one or two South American canine species;
from several races or species of jackal; and perhaps from one or more extinct
species.”
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Hare Indian Dog (Stonehenge) |
Thus, Darwin saw
dogs as being domesticated multiple times in multiple cultures, a far broader
domesticating interface than anyone would argue now. (The notion that domestic dogs came solely from wolves was suggested in a letter from Charles Lyell to Darwin, October 22, 1859,
Letter 2508f. The primary argument was the identical gestation period of the two species. Although Darwin believed dogs came from multiple species, he stated in a letter to Lyell that "we believe that all canine species have descended from one parent."
Letter 2510; see also Darwin's letter to Caroline Wedgwood,
November 1859.)
Darwin believed that domestication could
happen comparatively easily when humans entered an area and encountered almost
any type of wild canid:
“The main argument in favour of the several breeds of the
dog being the descendants of distinct wild stocks, is their resemblance in
various countries to distinct species still existing there. It must, however, be admitted that the
comparison between the wild and domesticated animal has been made but in few
cases with sufficient exactness. Before
entering on details, it will be well to show that there is no a priori
difficulty in the belief that several canine species have been
domesticated. Members of the dog family
inhabit nearly the whole world; and several species agree pretty closely in
habits and structure with our several domesticated dogs. Mr. Galton has shown
how fond savages are of keeping and taming animals of all kinds. Social animals are the most easily subjugated
by man, and several species of Canidae
hunt in packs. It deserves notice, as
bearing on other animals as well as on the dog, that at an extremely ancient
period, when man first entered any country, the animals living there would have
felt no instinctive or inherited fear of him, and would consequently have been
tamed far more easily than at present.
For instance, when the Falkland Islands were first visited by man, the
large wolf-like dog (Canis antarcticus)
fearlessly came to meet Byron’s sailors, who, mistaking this ignorant curiosity
for ferocity, ran into the water to avoid them: even recently a man, by
holding a piece of meat in one hand and a knife in the other, could sometimes
stick them at night.”
The Falkland Islands dog, no longer considered a canine, but
rather a member of a separate canid genus, was the subject of a
prior blog.
In
his notes from the HMS Beagle, Darwin referred to the animal as a large
wolf-like fox.
He was one of the last
naturalists to see them before they became extinct.
Two different dogs of North America, in
Darwin’s opinion, came from different wild canids.
He cited an account of the Hare Indian dog
which said it was similar to the coyote, while the Esquimaux dog was similar to
the great grey wolf.
Quoting an account that Esquimaux dogs, when pulling a sledge, remain in a compact body but diverge and separate when they come to thin ice so that their weight might be more evenly distributed, Darwin speculates that this "instinct may possible have arisen since the time, long ago, when dogs were first employed by the natives in drawing their sledges," but he also suggests an alternative source for this behavior: "Arctic wolves, the parent-stock of the Esquimaux dog, may have acquired an instinct, impelling them not to attack their prey in a close pack, when on thin ice."
Darwin dismisses the argument that
North American dogs came from Asia:
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Exquimaux Dog (Stonehenge) |
“[I]t might be argued
that when man first migrated into America he brought with him from the Asiatic
continent dogs which had not learned to bark; but this view does not seem
probable, as the natives along the line of their march from the north
reclaimed, as we have seen, at least two N. American species of Canidae.”
Not only did Darwin believe that wild canines were easily
domesticated, but he also believed that this was still happening, and that
domesticated dogs were sometimes bred with wild canids for specific reasons:
“It is a more important consideration that several canine
species evince … no strong repugnance or inability to breed under confinement;
and the incapacity to breed under confinement is one of the commonest bars to
domestication. Lastly, savages set the
highest value … on dogs: even half-tamed animals are highly useful to them: the
Indians of North America cross their half-wild dogs with wolves, and thus
render them even wilder than before, but bolder: the savages of Guiana catch
and partially tame and use the whelps of two wild species of Canis, as do the savages of Australia
those of the wild Dingo. Mr. Philip King
informs me that he once trained a wild Dingo puppy to drive cattle, and found
it very useful. From these several
considerations we see that there is no difficulty in believing that man might
have domesticated various canine species in different countries. It would indeed have been a strange fact if
one species alone had been domesticated throughout the world.”
Darwin saw domestication as generally a good thing. In The
Descent of Man, he said:
“Our domestic dogs are
descended from wolves and jackals, and though they may not have gained in
cunning and may have lost in wariness and suspicion, yet they have progressed
in certain moral qualities, such as in affection, trust-worthiness, temper, and
probably in general intelligence.”
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Dingo (Stonehenge) |
As will be discussed further below, Darwin’s opinions on the
development of breeds of dogs were connected to his belief that domestic dogs
came from a number of wild ancestors. Darwin included few drawings of dogs outside of a behavioral context, so most of the plates included here are taken from two authors he referred to, Stonehenge and Youatt.
The HMS Beagle
While on the expedition of the HMS Beagle, Darwin
made many notes about dogs. At an estancia at Berguelo on the Pampas, he wrote down some observations
about sheep guarding dogs in the area:
“I saw and heard of the shepherd-dogs of the country. When riding, it is a common thing to meet a
large flock of sheep guarded by one or two dogs, at the distance of some miles
from any house or man. I often wondered
how so firm a friendship had been established.
The method of education consists in separating the puppy, while very
young, from the bitch, and in accustoming it to its future companions. A ewe is held three or four times a day for
the little thing to suck, and a nest of wool is made for it in the sheep-pen;
at no time is it allowed to associate with other dogs, or with the children of
the family. The puppy is, moreover,
generally castrated; so that, when grown up, it can scarcely have any feeling
in common with the rest of its kind.
From this education it has no wish to leave the flock, and just as
another dog will defend its master, man, so will these the sheep. It is amusing to observe, when approaching a
flock, how the dog immediately advances barking, and the sheep all close in his
rear, as if round the oldest ram. These
dogs are also easily taught to bring home the flock, at a certain hour in the
evening. Their most troublesome fault,
when young, is their desire of playing with the sheep; for in their sport they
sometimes gallop their poor subjects most unmercifully.”
An observation published towards the end of Darwin’s life came from his travels around South America aboard the Beagle:
“When the Fuegians are hard pressed by want, they kill their
old women for food rather than their dogs; for, as we were assured, ‘old women
no use—dogs catch otters.’” (Letter 203, March 30, 1833, says this information came from what a Fuegian boy told a Sealing Captain.)
The Fuegian dogs were also good at getting "shell-fish":
“In [Tierro del Fuego], so I am informed by Mr. Bridges, the
Catechist to the Mission, the dogs turn over the stones on the shore to catch
the crustaceans which lie beneath, and they ‘are clever enough to knock off the
shell-fish at a first blow;’ for if this be not done, shell-fish are well known
to have an almost invincible power of adhesion.”
The shell-fish may have been limpets. These dogs were also "excellent swimmers, and ready to bring any bird out of the sea," and made good watchdogs. (Letter 2643)
Darwin’s Pets
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Dog in Humble and Affectionate Frame of Mind (Darwin, Expression of Emotions, 1873) |
Darwin makes frequent
reference to his own dogs. In describing
a difference in behavior patterns of large and small dogs, he includes
observations of a terrier he owned:
“Dogs and jackals take much pleasure in rolling and rubbing
their necks and backs on carrion.
The
odour seems delightful to them, though dogs at least do not eat carrion.
Mr. Bartlett has observed wolves for me, and
has given them carrion, but has never seen them roll on it.
I have heard it remarked, and I believe it to
be true, that the larger dogs, which are probably descended from wolves, do not
so often roll in carrion as do smaller dogs, which are probably descended from
jackals.
When a piece of brown biscuit
is offered to a terrier of mine and she is not hungry (and I have heard of
similar instances), she first tosses it about and worries it, as if it were a
rat or other prey; she then repeatedly rolls on it precisely as if it were a
piece of carrion, and at last eats it.
It would appear that an imaginary relish has to be given to the
distasteful morsel; and to effect this the dog acts in his habitual manner, as
if the biscuit was a live animal or smelt like carrion, though he knows better
than we do that this is not the case.
I
have seen this same terrier act in the same manner after killing a little bird
or mouse.” (See
Letter 13782, in which spaniels and a poodle are described as rolling over morsels, such as dried figs.)
In the same book that includes this description, The Expression of the Emotions in Man and
Animals (1872), Darwin also mentions a large dog he owned:
“I formerly possessed a large dog, who, like every other
dog, was much pleased to go out walking.
He showed his pleasure by trotting gravely before me with high steps,
head much raised, moderately erected ears, and tail carried aloft but not
stiffly. Not far from my house a path
branches off to the right, leading to the hot-house, which I used often to
visit for a few moments, to look at my experimental plants. This was always a great disappointment to the
dog, as he did not know whether I should continue my walk; and the
instantaneous and complete change of expression which came over him, as soon as
my body swerved in the least towards the path (and I sometimes tried this as an
experiment) was laughable. His book of
dejection was known to every member of the family, and was called his hot-house face. This consisted in the head drooping much, the
whole body sinking a little and remaining motionless; the ears and tail falling
suddenly down, but the tail was by no means wagged. With the falling of the ears and his great
chaps, the eyes became much changed in appearance, and I fancied that they
looked less bright.”
Referring to the terrier, Darwin describes the habitual
movement by which she shows her delight, “namely, by licking the air as if it
were my hand.” Noting how common this
behavior is, and that dogs will even lick cats with whom they have become
friends, he connects the behavior to a possible origin:
“This habit probably originated in the females carefully
licking their puppies—the dearest object of their love—for the sake of
cleansing them. They also often give
their puppies, after a short absence, a few cursory licks, apparently from
affection.”
Dogs in Darwin's Correspondence
Darwin does not name his dogs in his books, but a letter of January 10, 1825, refers to a family pet, Spark. (Sounds like a terrier to me.) Another mentions Shelah and Spark looking "the pictures of melancholy." (Letter 17) Spark was lent out when a neighbor needed a watch dog, but Czar had to be given Dr. Parker, "having bit another person," but in the new location "there are a profusion of rats and mice about for her to kill." (Letter 18, December 4, 1825)
When Spark died, after giving birth to one puppy, Marianne Parker wrote to Darwin that she would miss that "poor little black nose." (Letter 23) Darwin himself reacted emotionally, writing that "I do not know how to express myself clearly." (Letter 24) A subsequent letter revealed that Spark died because her puppies were too large for her to bear them and none were born alive. (Letter 27)
Canine Behavior
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Dog Approaching Another Dog with Hostile Intention (Darwin, Expression) |
As already described, Darwin
sought to trace behavior of dogs back to wolves or jackals, but sometimes saw
it going only to one of the ancestors:
“Dogs, when they wish to go to sleep on a carpet or other
hard surface, generally turn round and round and scratch the ground with their
fore-paws in a senseless manner, as if they intended to trample down the grass
and scoop out a hollow, as no doubt their wild parents did, when they lived on
open grassy plains or in the woods.
Jackals, fennecs, and other allied animals in the Zoological Gardens,
treat their straw in this manner; but it is a rather odd circumstance that the
keepers, after observing for some months, have never seen the wolves thus
behave. A semi-idiotic dog—and an animal
in this condition would be particularly liable to follow a senseless habit—was
observed by a friend to turn completely round on a carpet thirteen times before
going to sleep.”
Some behaviors went back to both ancestors:
“Dogs after voiding their excrement often make with all four
feet a few scratches backwards, even on a bare stone pavement, as if for the
purpose of covering up their excrement with earth, in nearly the same manner as
do cats. Wolves and jackals behave in
the Zoological Gardens in exactly the same manner, yet, as I am assured by the
keepers, neither wolves, jackals, nor foxes, when they have the means of doing
so, ever cover up their excrement, any more than do dogs. All these animals, however, bury superfluous
food…. [This is] a purposeless remnant of an habitual movement, which was
originally followed by some remote progenitor of the dog-genus for a definite
purpose, and which has been retained for a prodigious length of time.”
Aggression and
Submission
In the Expression of Emotions, Darwin described a number of
contrasting types of behavior, including the considerable difference between
preparing to attack and attempting to submit:
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Dog Caressing His Master (Darwin, Emotions) |
“When a dog
approaches a strange dog or man in a savage or hostile frame of mind he walks
upright and very stiffly; his head is slightly raised, or not much lowered; the
tail is held erect and quite rigid; the hairs bristle, especially along the
neck and back; the pricked ears are directed forwards, and the eyes have a
fixed stare…. These actions, as will hereafter be explained, follow from the
dog’s intention to attack his enemy, and are thus to a large extent
intelligible. As he prepares to spring
with a savage growl on his enemy, the canine teeth are uncovered, and the ears
are pressed close backwards on the head; but with these latter actions, we are
not here concerned. Let us now suppose
that the dog suddenly discovers that the man whom he is approaching, is not a
stranger, but his master; and let it be observed how completely and
instantaneously his whole bearing is reversed.
Instead of walking upright, the body sinks downwards or even crouches,
and is thrown into flexuous movements; his tail, instead of being held stiff
and upright, is lowered and wagged from side to side; his hair instantly
becomes smooth; his ears are depressed and drawn backwards, but not closely to
the head; and his lips hang loosely.
From the drawing back of the ears, the eyelids become elongated, and the
eyes no longer appear round and staring.
It should be added that the animal is at such times in an excited
condition from joy; and nerve-force will be generated in excess, which
naturally leads to action of some kind.”
Here also, he found it expedient to mention his terrier:
“Dogs when approaching a strange dog, may find it useful to
show by their movements that they are friendly, and do not wish to fight. When two young dogs in play are growling and
biting each other’s faces and legs, it is obvious that they mutually understand
each other’s gestures and manners. There
seems, indeed, some degree of instinctive knowledge in puppies and kittens,
that they must not use their sharp little teeth or claws too freely in their
play, though this sometimes happens and a squeal is the result; otherwise they
would often injure each other’s eyes.
When my terrier bites my hand in play, often snarling at the same time,
if he bites too hard and I say gently,
gently, he goes on biting, but answers me by a few wags of the tail, which
seems to say ‘Never mind, it is all fun.’
Although dogs do thus express, and may wish to express, to other dogs
and to man, that they are in a friendly state of mind, it is incredible that
they could ever have deliberately thought of drawing back and depressing their
ears, instead of holding them erect,--of lowering and wagging their tails,
instead of keeping them stiff and, etc., because they knew that these
movements stood in direct opposition to those assumed under an opposite and
savage frame of mind.”
Anyone who owns dogs knows that they sometimes have relationships that cannot be explained by relative size or strength. Darwin was no exception:
“The feeling of affection of a dog towards his master is
combined with a strong sense of submission, which is akin to fear.
Hence dogs not only lower their bodies and crouch
a little as they approach their masters, but sometimes throw themselves on the
ground with their bellies upwards.
This
is a movement as completely opposite as is possible to any show of resistance.
I formerly possessed a large dog who was not
at all afraid to fight with other dogs; but a wolf-like shepherd-dog in the
neighbourhood, though not ferocious and not so powerful as my dog, had a
strange influence over him.
When they
met on the road, my dog used to run to meet him, with his tail partly tucked in
between his legs and hair not erected; and then he would throw himself on the
ground, belly upwards.
By this action,
he seemed to say more plainly than words, ‘Behold, I am your slave.'"
That canine submissiveness was understood even in antiquity, see the first plate in
Anthropomorphism in Antiquity.
Barking
Darwin attempted to fathom why dogs bark:
“That the pitch of the voice bears some relation to certain
states of feeling is tolerably clear. A
person gently complaining of ill-treatment, or slightly suffering, almost
always speaks in a high-pitched voice.
Dogs, when a little impatient, often make a high piping note through
their noses, which at once strikes us as plaintive; but how difficult it is to
know whether the sound is essentially plaintive, or only appears so in this
particular case, from our having learnt by experience what it means!”
He notes that tamed jackals and Canis latrans (coyote) of North America barked, but believed this
barking was “a noise not proper to any species of the genus” besides these
two. Here again he sees a difference
between some large and some small dogs:
“Under the expectation of any great pleasure, dogs bound and
jump about in an extravagant manner, and bark for joy. The tendency to bark under this state of mind
is inherited, or runs in the breed: greyhounds rarely bark, whilst the
Spitz-dog barks so incessantly on starting for a walk with his master that he
becomes a nuisance.”
In The Descent of Man,
Darwin saw barking as having a communicative value with humans:
“It is a more remarkable fact that the dog, since being
domesticated, has learnt to bark in at least four or five distinct tones. Although barking is a new art, no doubt the
wild parent-species of the dog expressed their feelings by cries of various
kinds. With the domesticated dog we have
the bark of eagerness, as in the case; that of anger, as well as growling; the
yelp or how of despair, as when shut up; the baying at night; the bark of joy,
as when starting on a walk with his master; and the very distinct one of demand
or supplication, as when wishing for a door or window to be opened.”
Play
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Italian Greyhounds (Stonehenge) |
Noting that dogs
often tuck their tails in play, Darwin wondered if dogs, when chasing foxes, attempt to bite their tails:
“When two young dogs chase each other in play, the one that
runs away always keeps his tail tucked inwards.
So it is when a dog, in the highest spirits, careers like a mad creature
round and round his master in circles, or in figures of eight. He then acts as if another dog were chasing
him. This curious kind of play, which
must be familiar to every one who has attended to dogs, is particularly apt to
be excited, after the animal has been a little startled or frightened, as by
his master suddenly jumping out on him in the dusk. In this case, as well as
when two young dogs are chasing each other in play, it appears as if the one
that runs away was afraid of the other catching him by the tail; but as far as
I can find out, dogs very rarely catch each other in this manner. I asked a
gentleman, who had kept foxhounds all his life, and he applied to other experienced
sportsmen, whether they had ever seen hounds thus seize a fox; but they never
had.”
I cannot help but suspect that the passage referring to a master jumping out on a dog at dusk is a description of how Darwin himself sometimes played with his dogs. Celebration is a behavior that Darwin finds
across canines:
“Almost all the expressive movements now described, with the
exception of the grinning from joy, are innate or instinctive, for they are
common to all the individuals, young and old, of all the breeds. Most of them are likewise common to the
aboriginal parents of the dog, namely the wolf and jackal; and some of them to
other species of the same group. Tamed
wolves and jackals, when caressed by their masters, jump about for joy, wag
their tails, lower their ears, lick their master’s hands, crouch down, and even
throw themselves on the ground belly upwards. I have seen a rather fox-like
African Jackal, from the Gaboon, depress its ears when caressed. Wolves and jackals, when frightened,
certainly tuck in their tails; and a tamed jackal has been described as
careering round his master in circles and figures of eight, like a dog, with
his tail between his legs.”
In a passage from The
Descent of Man, Darwin finds that dogs may even have a sense of humor:
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Bloodhound (Stonehenge) |
“Dogs show what may
be fairly called a sense of humour, as distinct from mere play; if a bit of
stick or other such object be thrown to one, he will often carry it away for a
short distance; and then squatting down with it on the ground close before him,
will wait until his master comes quite close to take it away. The dog will then seize it and rush away in
triumph, repeating the same manoeuvre, and evidently enjoying the practical
joke.”
Development of Breeds
As already mentioned, Darwin did not believe that the
diversity of dogs could be solely explained by breeding choices subsequent to
domestication:
“[W]ho will believe that animals closely resembling the
Italian greyhound, the blood hound, the bull-dog, pug-dog, or Blenheim spaniel,
etc.—so unlike all wild Canidae—ever
existed in a state of nature? It has
often been loosely said that all our races of dogs have been produced by the
crossing of a few aboriginal species; but by crossing we can only get forms in
some degree intermediate between their parents; and if we account for our
several domestic races by this process, we must admit the former existence of
the most extreme forms, as the Italian greyhound, bloodhound bull-dog, etc., in
the wild state. Moreover, the
possibility of making distinct races by crossing has been greatly exaggerated.”
Darwin believed
some variation was due to crossing the aboriginal stocks:
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Bulldog (Stonehenge) |
“[T]he form of the greyhound
may be partly accounted for by descent from some such animal as the slim
Abyssinian Canis simensis, with its
elongated muzzle; that of the larger dogs from the larger wolves, and the small
and slighter dogs from the jackals: and thus perhaps we may account for certain
constitutional and climatal differences…. The intercrossing of the several
aboriginal wild stocks, and of the subsequently formed races, has probably
increased the total number of breeds, and, as we shall presently see, has
greatly modified some of them. But we cannot explain by crossing the origin of
such extreme forms as thoroughbred greyhounds, bloodhounds, bulldogs, Blenheim
spaniels, terriers, pugs, etc., unless we believe that forms equally or more
strongly characterised in these different respects once existed in nature.”
Egypt
Darwin saw the plates of Rosellini described in a
prior piece:
“I have looked through the magnificent works of Lepsius and
Rosellini, and on the Egyptian monuments from the fourth to the twelfth
dynasties (i.e. from about 3400 B.C. to 2100 B.C.) several varieties of the
dog are represented; most of them are allied to greyhounds; at the later of
these periods a dog resembling a hound is figured, with drooping ears, but with
a longer back and more pointed head than in our hounds. There is, also, a turnspit, with short and
crooked legs, closely resembling the existing variety; but this kind of
monstrosity is so common with various animals … that it would be rash to look
at the monumental animal as the parent of all our turnspits….”
He does not fall into the trap of believing that the
resemblance of these dogs to modern breeds means that the modern breeds are
actually ancient:
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Spanish Pointer (Stonehenge) |
“We thus see that, at
a period between four and five thousand years ago, various breeds, viz. pariah
dogs, greyhounds, common hounds, mastiffs, house-dogs, lapdogs, and turnspits,
existed, more or less closely resembling our present breeds. But there is not sufficient evidence that any
of these ancient dogs belonged to the same identical sub-varieties with our
present dogs.”
Pointers
Darwin must have gone on some hunts, for he watched hunting dogs at work:
“It may be doubted whether any one would have thought of
training a dog to point, had not some one dog naturally shown a tendency in
this line; and this is known occasionally to happen, as I once saw, in a pure
terrier: the act of pointing is probably, as many have thought, only the exaggerated
pause of an animal preparing to spring on its prey. When the first tendency to point was once
displayed, methodical selection and the inherited effects of compulsory
training in each successive generation would soon complete the work; and
unconscious selection is still in progress, as each man tries to procure,
without intending to improve the breed, dogs which stand and hunt best.”
He observes that although the English pointer “certainly
came from Spain,” the two do not look much alike any more.
He also found the behavior of dogs in retrieving worthy of
consideration:
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English Pointer (Stonehenge) |
“Mr. Colquhoun winged
two wild-ducks, which fell on the further side of a stream; his retriever tried
to bring over both at once, but could not succeed; she then, though never
before known to ruffle a feather, deliberately killed one, brought over the
other, and returned the dead bird. Col.
Hutchinson relates that two partridges were shot at once, one being killed,
the other wounded; the latter ran away, and was caught by the retriever, who on
her return came across the dead bird; ‘she stopped evidently greatly puzzled,
and after one or two trials, finding she could not take it up without
permitting the escape of the winged bird, she considered a moment, then
deliberately murdered it by giving it a severe crunch, and afterwards brought away both together. This was the only known instance of her ever
having wilfully injured any game.’ Here we have reason though not quite
perfect, for the retriever might have brought the wounded bird first and then
returned for the dead one, as in the case of the two wild-ducks.”
Mutations
Curt Stern, whose human genetics course at Berkeley opened
many eyes, including mine, said that we must never forget that Darwin was
developing his ideas without the benefit of Mendel’s understanding of
genetics. (Gregor Mendel did know about Darwin. Richard Dawkins (2009) describes opening a copy of On the Origin in the library of Mendel's monastery in Brno and finding Mendel's margin notes.)
As far as I know, Darwin never
called the sudden appearance of a trait a mutation. (He did use “mutations” when referring to all
the changes in physical conditions and species in a geographic area.) Instead, he referred to monstrosities:
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Pugs (Stonehenge) |
“Some of the peculiarities
characteristic of the several breeds of the dog have probably arisen suddenly,
and, though strictly inherited, may be called monstrosities; for instance, the
shape of the legs and body in the turnspit of Europe and India; the shape of
the head and the under-hanging jaw in the bull-dog and pug-dog, so alike in
this one respect and so unlike in all others.
A peculiarity suddenly arising, and therefore in one sense deserving to
be called a monstrosity, may, however, be increased and fixed by man’s
selection. We can hardly doubt that
long-continued training, as with the greyhound in coursing hares, as with water-dogs
in swimming—and the want of exercise, in the case of lapdogs—must have produced
some direct effect on their structure and instincts.”
Breeding as Imitating
Natural Selection
Darwin frequently observed that breeding dogs with the
certain desirable traits mimicked natural selection:
“We may confidently infer that no man ever selected his
water-dogs by the extent to which the skin was developed between their toes;
but what he does, is to preserve and breed from those individuals which hunt
best in the water, or best retrieve wounded game, and thus he unconsciously
selects dogs with feet slightly better webbed. The effects of use from the
frequent stretching apart of the toes will likewise aid in the result. Man thus closely imitates Natural Selection.”
Dogs have altered their relationship to our livestock in the process of domestication:
|
Poodle (Youatt) |
“It is scarcely possible to doubt
that the love of man has become instinctive in the dog. All wolves, foxes, jackals, and species of
the cat genus, when kept tame, are most eager to attack poultry, sheep, and
pigs; and this tendency has been found incurable in dogs which have been
brought home as puppies from countries such as Tierra del Fuego and Australia,
where the savages do not keep these domestic animals. How rarely, on the other hand, do our
civilised dogs, even when quite young, require to be taught not to attack
poultry, sheep, and pigs! No doubt they occasionally do make an attack, and are
then beaten; and if not cured, they are destroyed; so that habit and some
degree of selection have probably concurred in civilising by inheritance our
dogs.”
Conclusion
Darwin worked without genetics, without much of a timeline
beyond that man must have existed for “incomparably longer” than 6,000 years, and
with little paleontology or archeology, though he did have the images brought
back from the early British explorers in Egypt and Mesopotamia. His sources were often letters he received from others, second- and third-hand information that he had no way of validating but which he often felt he could trust. He saw many types of canids aboard the
Beagle, but knew wolves and jackals mostly from London’s Zoological
Gardens. Photography was still in its
infancy but naturalists were expected to have artistic skills in that age that
most of them could not conceive of now.
Despite such limitations, he fathomed a changing biological
world and applied a principle to it that shocks the world to this day. Given our modern tendency to look to
genetics—more narrowly, genome research—before everything else in describing
canine evolution, it is refreshing to read someone drawing wisdom from whatever
limited sources are available.
Variations in behavior are particularly important to Darwin,
with small dog behavior coming from jackals and large dog behavior from
wolves. Although he was not right about
this, Darwin presented issues that still bear discussion. How is the extreme variability in the dog
phenotype to be explained? What
mutations have happened more than once?
How similar were dogs depicted on Egyptian tombs to breeds that look
much the same now? How conscious were
men of prior ages that they were refining traits for increased utility of the
dogs they employed? Why is barking more
common in dogs than wild canids? Do domestic dogs in specific areas resemble
wild canids of those areas, and how much interbreeding occurs? What behaviors
carry over from wild canids, and what do not?
There was a time when I thought I would be a biologist, but
that world closed for me long ago. I do
not know if I would have made any contribution worthy of anyone’s attention,
but I do know that had I pursued such dreams, I would have worked in the shadow
of a great figure. There is no
equivalent in the law, or in most disciplines. In the psychology of the ancient
world, Darwin might have been made a deity, like Asklepios to medicine. His fate, from much of the modern spiritual community, has not been nearly as positive.
My senior advisor at Berkeley, Richard Dawkins, then an Assistant Professor in the Zoology Department, warned me against making casual references without reading
what Darwin really said. Having put
Darwin in a box for forty years, it is wonderful to find that turning the pages is still a pleasure, even more than before.
Bibliography:
- Clutton-Brock, J. (1977). Man-Made Dogs. Science, 197(4311), 1340-1342) (recounting history of classification of Flakland Islands wolf).
- Darwin, C. (1971). The
Descent of Man, and Selection in Relation to Sex. John Murray, London.
- Darwin, C. (1873). The Expression of the Emotions in Man and
Animals. Appleton & Co., New
York.
- Darwin, C. (1859). On
the Origin of Species by Means of Natural Selection, or the Preservation of
Favoured Races in the Struggle for Life. John Murray, London.
- Darwin, C. (1868). The
Variation of Animals and Plants under Domestication. John Murray,
London.
- Dawkins, R. (2009). The Greatest Show on Earth: The Evidence for Evolution. Free Press, New York.
- Derr, M. (2009). Darwin's Dogs: Celebrating the Bicentennial of the Father of Evolution. The Bark (February 27, 2009).
- Larson, G., Karlsson, E.K., Perri, A., et al. (2012). Rethinking
Dog Domestication by Integrating Genetics, Archeology, and Biogeography.
Proceedings of the Naitonal Academy of Sciences, 109(23), 8878-83.
- Lorenz, K. (1954). Man Meets Dog. Methuen, London.
(Translation of So kam der Mensch auf den Hund (1949), G. Borotha-Schoeler,
Vienna); Lorenz's rejection of the jackal ancestry of domestic dogs is found in his introduction to The Wild Canids: Their Systematics, Behavioral Ecology and Evolution (Fox, M.W., ed.) (1975). Litton Educational Publishing "Although the golden jackal has to be excluded from being a possible ancestor of most domestic breeds, I still maintain that the races which I orignally have called 'lupus dogs,' e.g., chow, husky, Greenland dogs etc., have a wild ancestor different from that of most or all other breeds." Thus, although Lorenz rejected jackal ancestry, he continued to believe that dogs could be distinguished by the wolf populations from which they descended.
- Ostrander, E.A., and Wayne, R.K. (2005). The Canine Genome.
Genome Research, 15, 1706-1716. Cold Spring Harbor Laboratoery
Press.
- Stonehenge (John Henry Walsh) (1859). The Dog in Health and Disease. Longman, Green, Longman, and Roberts, London.
- Townshend, E. (2009). Darwin's Dogs: How Darwin's Pets Helped Form a World-Changing Theory of Evolution. Frances Lincoln.
- Youatt, W. (1857). The Dog. Leavitt and Allen. New York.
Thanks to Richard Hawkins, Brian Duggan, and Eric Krieger for additional sources and corrections. Thanks to Richard Dawkins for a note about limpets and for posting part of an email about a conflict regarding evolution that my father had concerning one of his books.