My American Bulldog was tumbled roughly by my first Catahoula about 9 months ago and hurt his lower back area (not his hips). Afterward, he got stuck beneath the travel trailer, where I was living at the time while my house was being built, and hurt himself again and then I think that the vet who came out to check him (my horse vet who did all the vaccinations last year) may have exacerbated the problem while stretching out his legs during the examination. I had Jack's hips x-rayed and the problem is not in his hips but I can't afford the specialist right now to determine exactly where or what the problem may be. My dog vet who x-rayed him recommended the specialist and also said that the problem, which I can't remember now what he indicated, would take at least six months to improve, then Jack hurt himself again. Some days he is not feeling well while other days he is just fine and he's improved a bit on NutroMax which supplements with glucosamine and chondroitin and I would like to give him therapeutic levels of a good supplement to help him through until I can pay for a specialist to pinpoint the problem. But there are so many supplements that I don't know which to buy. Jack is also very sensitive in his stomach. Any suggestions?