Not only are instances of quarrelsomeness to be found Dogs, but also of the strongest desire to revenge real or supposed injuries, of the exercise of a wonderful amount of cunning and reasoning power to bring a hated rival to justice. The following anecdote forms a capital antithesis to that of Mr. Romanes’ Terrier, who prevented the escape of the Dog he disliked and was jealous of, although such an event would have brought him the greatest possible comfort:-- “A fine Terrier, in the possession of a surgeon, about three weeks ago, exhibited its sagacity in a rather amusing manner. It came into the kitchen and began plucking the servant by the gown, and in spite of repeated rebuffs, it perseveringly continued in its purpose. The mistress of the house hearing the noise, came down to inquire the cause, when the animal treated her in a similar manner. Being struck with the concern evinced by the creature, she quietly followed it up-stairs into a bed-room, whither it led her; there it commenced barking, looking under the bed, and then up in her face. Upon examination, a Cat was discovered there quietly demolishing a beef-steak, which it had feloniously obtained. The most singular feature in the whole case is that the Cat had been introduced into the house only a short time before, and that bitter enmity prevailed between her and her canine companion.” Besides illustrating the desire for vengeance, this is as good an instance of reason as any we have given. The Dog evidently argued to himself in this wise:--“If I fly upon this wretched Cat and deprive her of her stolen goods by force, she will get nothing more than a fright, or, perhaps, a few tooth marks; but if I lodge a complaint against her before the proper tribunal, her guilt will be manifest to the whole household, and she will be got rid of, or even killed.” The Dog, by the way he conceived and acted on this plan, showed himself to be nearly as clever and almost as wicked as a great many men one reads about in history. We have spoken of maternal love as exhibited by the Dog. This is, of course, a case of instinct; but instances are not wanting in which Dogs have shown the high faculty of devoted love towards other than their offspring, and of friendship like that of Ruth for Naomi. Mr. Darwin mentions a Greyhound bitch who, contrary to the usual custom of her race, fell deeply in love with a Pointer, and would have nothing to say to any other Dog during the life of her lover; and, stranger still, when he died, she showed a constancy equal to that of the best of her sex among the human race, and remained strictly faithful to his memory, never afterwards bearing pups.