At all events, Tom had resented the entrance of the Eskimo, Wolf, into the Kennel; and never failed, when "Scotty" was not about, to manifest an enmity that would have told a civilized dog not to attempt any liberties with him. But Wolf was only an ignorant puppy, taken from a native igloo, where all of the dogs and all of the family lived in happy harmony; and so, one day when he was particularly joyous, he nipped, in a spirit of mischief, the end of Tom's wagging stump of a tail. Tom wheeled instantly, his hair bristling and his jaws apart, but the timely arrival of Matt made further demonstration impossible; and Tom's instinctive dislike for Wolf grew into an obsession after that direct and personal insult.