My 9 yr. old is having a problem with her right hind leg. It seems to give out on occasion when she is running it slides to one side. At first I thought it was because she was running on my kitchen floor that might have been slippery but I noticed it happened on the carpeting too. She is not overweight, eats and drinks normally. She doesn't seem to be in any pain. I can touch her back legs with out any discomfort. She is still very playful. Only problem being the leg seeming to give out. Does anyone have any ideas or have they themselves experienced this problem? I would appreciate any help you can give me.