I have a kitten, Gabby, who is about 6 months old now. She was the runt of her litter and all her vaccinations are up-to-date. Just in the past 2 weeks she started to walk funny, almost like she was drunk! And it continues to get a little worse each day. She seems to have no problems with her front legs, just the hind legs are so wobbly and seem weak, but she still has power in them. She really sticks her rear up in the air and walks on the "toes" of her back legs. She doesn't act like she is in any pain and isn't sick in any other way. Has anyone ever heard of anything like this before?