clear up the limp with rimadyl , if she's limping it hurts , otherwise she wouldn't limp ……… after it's cleared up from the rimadyl i'd start walking her up and down moderate hills , they can shift the weight to the front on flat surfaces and not really exercise their rears , they'll continue to atrophy …... i'd try to get her off the rimadyl , only give it to her if she gets sore , to get her back to un-sore , try to find the amount of exercise she can handle without getting sore …….. as for a supplement I think phycox helps , at least it appeared to , to me …....the idea is to get rid of the inflammation and exercise the joint as much as possible without getting it inflamed again , build strength , the sore leg will become weaker and weaker left to it's own ……. you should be able to gradually increase the amount of exercise without aggravating the joint ……. if you can't get rid of the limp without the rimadyl , I personally have used long term phycox along with intermittent as needed rimadyl for long periods of time , many years ……..