I got him for free, I work at a vet clinic, and a breeder brought him in to be euthanized because his back legs didnt work. He was the cutest little thing in the world and when I looked in the box he meeped (a weird noise he makes) at me looking helpless with his big blue eyes, I had to help him. Months of physical therapy got him care got him walking. were still not sure what happened to him, physiologically he is normal, blood tests, x-rays, and exams reveal nothing. He still is weak in his back legs, when he runs, he hopps with them like a bunny (extremely funny looking) and he cant jump very well, he has to climb everything, but he walks slowly ok, just not normal. He's our special little man.