So I have been working hard at leaning out Bernie. At one point he was over 80 pounds and slowly have decreased his feed and up the cardio work. He used to limp sometimes when we did the flirtpole this is when he was chubbier, I figured the turning and sprint was not good for him so I kept the running patterns normal without extreme cuts. I have noticed a tremendous improvement in his energy levels and working drive since he lost weight. He is so much faster and agile and I figured now that he is lighter the flirtpole can be used normally. Last night he was running after it and felt I think he slipped, I thought nothing of it and then stopped and started limping again his back right leg. Immediately after limping he came and started licking my leg to let me know something was wrong. I stopped the play and we went inside and gave him a massage and put a little ice on it but he didnt like the icea idea lol anyway he was walking a little funny last night but this morning he seems to be walking normal. Can this be like a pulled muscle or something worse like a torn acl or something? I am getting his hips done in less than a month but I am so demoralized because he was looking great and was getting so fit. I don't want to hurt the dog do you guys know what could cause rear leg limping?