I had a guy I know pick up 7 rabbits from his mother in law. They are 8 & 12 weeks old. He was keeping them in a large dog carrier over night, on the ground, & it had 6" x6" openings at the bottom. I think it got it's leg between the ground & bottom of the cage. It drags it's back end around. I've seen it move the one leg but the other stays straight out. It will roll up on it's bottom when it get alert like it is ready to bolt but rolls back to it's side to move. It normally laid on the side that isn't working. At first I hoped it was just from low circulation & would go back to normal but 26 hours later it isn't doing any better. It is eating & drinking well. My guess is it is one of the 8 week old ones since it is the smaller of the two sizes.