My dog, Spatsy, is 11 years old, she cannot hear very well, not that, that has anything to do with my question, but she will try to come up the stairs and her back legs will not work right. We don't know what is wrong with her. I really need some answers. She will be walking one minute and her legs will work fine, but the next minute, they will not work at all, is this at all realated to diabetes, or arthritis. Please help!!