I have Troi 1 year, because she my husband's dog, so with me she never met vet. We didnt have reason go to vet, because she hadn't any problem. Her legs became to be worse about 4 months ago, but I know it because her age and nothing can help it, because I had the same poblem with my cat when he was 18 years old. It looks absoulutely same, he just lyed down and cant really move.

PS: Are you vet?