Padfoot was born with Polymelia, but was later cured.
When Padfoot was born, the sight of him frightened his mother and the other mother-wolves. There's just... too many legs for one puppy to have. The legs seem to be growing out of his body as though there's another puppy hidden deep inside of it. He's moving, however, and he tried to suckle milk.
Padfoot is trying to explore the world around him. His extra limbs twitch and move as he crawls around the den. He's very weak and doesn't get very far before getting visibly exhausted.
His mother brought him to Ozark, who fed him an osha root. It put him to sleep as his limbs were amputated. He was in great pain for a few days as he healed in the medicine den, but soon learned how to walk and was happy to be able to play with his siblings.