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Probably a combination of arthritis and possibly hip displacia. Hip displacia is pretty common in a lot of large breed dogs. Labs and German shepards especially. My female lab started having troubles around 8 or 9 and we had to slow her down. It cane down to her ridin in the pickup while grouse hunting and getting to make retrieves then being lifted back on the truck. Probably start takin it easy on him as 9 is starting to get up there in age. I would recommend glucosamine and chondroitin supplements and maybe some bufferin for the pain. good luck