Different breeds are prone to different problems, so do your research on your dog’s breed or mix. Certain symptoms should send you right off to the veterinarian. If your dog (especially toy dog) skips with a back leg up in the air, she may have a subluxating patella (slipping kneecap). If your larger breed gets up by heaving himself up on his front legs first, then pulling his rear up, if he hops upstairs or bunny hops in the rear when he runs, he may have hip problems. Limping in the front can signal a light sprain, panosteitis, or a more serious problem like elbow dysplasia or osteochondritis. Every year brings improvements in treatment, so talk to your veterinarian about options.