One of my sisters buns, Jack, a lionhead has lost the use of his back legs. Last week he started getting wobbly but this morning she found him in his bedroom with a wet bottom so he'd been there for a while. He tries to pull himself along but the weight of his legs are too much for him. The vet said it's old age but he's only 5 but has given him some anti-biotics incase it an infection.
She has moved him indoors so he can be warm and comfortable.

Does anyone have any ideas? Will he get better?