prince is almost 9months old and weighs 5 pounds.. when he runs he lifts he back left paw but when he walks he uses it normally. I felt all around and he isnt in pain, i dont see anything in the paw pad. Everything feels normal. I dont know if i should take him for an xray. It has been about 3days and he still lifts it when running. The only thing I am concerned about is luxating patella because we have a highrise bed and he uses doggy stairs to get on the bed but he jumps off the bed. He wont use the stairs to get back down.. he has been jumping off the bed for a while now. For now I have blankets on the floor to soften his landing. I just wanted to see what you guys thought before taking him into the Vet