My dog, Barret, a 5-year-old mixed breed, has a sore right back leg. He limps and holds the leg up a lot and doesn't want to put weight on it. He's been tested for Lyme disease and two other things (which I can't remember) but they were all three negative. He won't go up and down steps but he will run a little outside, and this puzzles me. He has taken about three months' worth of a supplement with glucosamine and chondroitin called Triple Strength Joint Max, which is supposed to rebuild cartilage and lubricate joints, but he doesn't seem to be any better. I'm reluctant to take him to the vet because of the expense and because I like to treat myself and my family (including the dogs) with supplements and natural therapies, but I guess, if he doesn't get better soon, we'll have to take him to the vet, at least for x-rays and to get a diagnosis. I was wondering if anyone else has had this problem with their dog.