I'm against giving pets anything on the advice of a pet owner's advice. What may be good for one, could be fatal for another. Rimadyl is a very potent pain killer, but lots of dogs throw up bile and have to discontinue it. It is hard on the liver, as are most meds. I would take the dog in for x-rays, she might have a hairline fracture or another fixable problem...at least you would have peace of mind.