My Staffordshire Bull Terrier Dilly is three years old. She loves to run. Every now and then, though, she ends up with a limp in her hind leg (always the same one). Usually this lasts for two days then she back is running on all fours. This time though it has lasted for two weeks. She is not in pain but very reluctant to put the fourth leg on the floor. I believe leg weakness is a genetic problem with the breed? I have not been to the vet because I thought honestly what could they do? But maybe there is a solution to this problem out there?