The vet is keeping him for the day. She wants to do some hip x-rays. She'll have to knock him out for that. He SCREAMED when she extended both hips. She doesn't think it's a fracture as he wouldn't be weightbearing if the bones were broken, but she doesn't know what else could be causing the pain. Could be a hairline fracture, arthritis, ect.

She's going to call me after the x-rays are done.

Thanks everyone.