Complicated as this train of reasoning is, it is the simplest one I can devise to account for the fact that slightly beyond the third milestone the terrier was awaiting me, lying right in the middle of the road with his face towards the town. I should add that the second two miles of the road were quite straight, so that I could easily have seen the dog if he had been merely running a comparatively short distance in front of the horses. Why this animal should never have returned to his former home on his own account I cannot suggest, but I think it was merely due to an excessive caution which he also manifested in other things. However, be the explanation of this what it may, as a fact he never did venture to come back upon his own account, although there never was a subsequent occasion upon which any of his former friends went to the town but the terrier was seen to return with them, having always found some way of escape from his intended imprisonment.
The Rev. J. C. Atkinson gives an account ('Zoologist,' vol. vii., p. 2338) of his terrier, which, on starting a water-rat out of reeds into the running stream, would not plunge directly after it, knowing that the rat would beat him at swimming. But the moment the rat plunged, the dog ran four or five yards down the bank, and there waited till the water-rat, being carried down stream, appeared upon the surface, when he pounced upon it successfully.
Cases of this kind might be multiplied indefinitely, and they appear to show a true faculty of reason or inferring.
Professor W. W. Bailey, writing from Brown University to 'Nature' (xxii., p. 607), says:—
A friend of mine, a naturalist, and a very conscientious man, whose word can be implicitly trusted, gives the following, to which he was an eye-witness. His grandfather, then a very old but hale and hearty man, had a splendid Newfoundland. There was a narrow and precipitous road leading from the fields to the house. It was regarded as a very dangerous place. One day when the old gentleman was doing some work about the farm his horse became alarmed, and started off with the waggon along this causeway. The chances were that he would dash himself and the empty waggon to pieces. At once the dog seemed to take in the situation, although until that time he had been impassive. He started after the horse at full speed, overtook him, caught the bridle, and by his strength arrested the frightened creature until help could reach him. My friend gives many other stories of this fine dog, and thinks he had a decided sense of humour. I will repeat that both of these tales come to me well authenticated, and I could, by seeking permission, give names and places.
Couch gives the following, which is worth quoting, as showing the intelligence of dogs in attacking unusual prey:—
On the first discovery of the prey (crabs) a terrier runs in to seize it, and is immediately and severely bitten in the nose. But a sedate Newfoundland dog of my acquaintance proceeds more soberly in his work. He lays his paw on it to arrest it in its escape; then tumbling it over he bares his teeth, and, seizing it with the mouth, throws the crab aloft. It falls upon the stones; the shell is cracked beyond redemption, and then the dainty dish is devoured at his leisure.[270]
I myself know a large dog in Germany which used to kill snakes by dexterously tossing them in the air a great number of times, too quickly to admit of the snake biting. When the snake was thus quite confused, the dog would tear it in pieces. This dog can never have been poisoned by the bite of a snake; but he seems to have had an instinctive idea that the snake might be more harmful in its bite than other animals; for while he was bold in fighting with dogs, and did not then object to receiving his fair share of laceration, he was extremely careful never to begin to tear a snake till he had thoroughly bewildered it by tossing it as described.
The reasoning displayed by dogs may not always be of a high order, but little incidents, from being of constant occurrence among all dogs, are the more important as showing the reasoning faculty to be general to these animals. I shall therefore give a few cases to show the kind of reasoning that is of constant occurrence.