When they were barely a fortnight old--almost as soon as their big mournful eyes opened--the two brown puppies died. There seemed no particular reason for their death, except the fact that a collie is always the easiest or else the most impossible breed of dog to raise. The fuzzy grayish baby alone was left--the puppy which was soon to turn to white and gold. The Mistress named him "Wolf." Upon Baby Wolf the mother-dog lavished a ridiculous lot of attention--so much that Lad was miserably lonely. The great collie would try with pathetic eagerness, a dozen times a day, to lure his mate into a woodland ramble or into a romp on the lawn, but Lady met his wistful advances with absorbed indifference or with a snarl. Indeed when Lad ventured overnear the fuzzy baby, he was warned off by a querulous growl from the mother or by a slash of her shiny white teeth. Lad could not at all understand it. He felt no particular interest--only a mild and disapproving curiosity--in the shapeless little whimpering ball of fur that nestled so helplessly against his beloved mate's side. He could not understand the mother-love that kept Lady with Wolf all day and all night. It was an impulse that meant nothing to Lad. After a week or two of fruitless effort to win back Lady's interest, Lad coldly and wretchedly gave up the attempt. He took long solitary walks by himself in the forest, retired for hours at a time to sad brooding in his favorite "cave" under the living-room piano, and tried to console himself by spending all the rest of his day in the company of the Mistress and the Master. And he came thoroughly to disapprove of Wolf. Recognizing the baby intruder as the cause of Lady's estrangement from himself, he held aloof from the puppy. The latter was beginning to emerge from his newborn shapelessness. His coat's texture was changing from fuzz to silk. Its color was turning from gray into yellow. His blunt little nose was lengthening and growing thin and pointed. His butter-ball body was elongating, and his huge feet and legs were beginning to shape up. He looked more like a dog now, and less like an animated muff. Also within Wolf's youthful heart awoke the devil of mischief, the keen urge of play. He found Lady a pleasant-enough playfellow up to a certain point. But a painfully sharp pinch from her teeth or a reproving and breath-taking slap from one of her forepaws was likely to break up every game that she thought had gone far enough; when Wolf's clownish roughness at length got on her hair-trigger nerves.