Did you vet offer medication for the arthritis, Tawny's been on a product called Medicam,(3 years) she had a wellness test done first and then we tried for 10 days on and 10 off, the improvement in her was night and day, she is a happy doggie now. There is no steriods in this product and you just squirt the measured amount on the food once a day, apparently is tastes like honey? Some pups can't take but it sure sound like your firbaby needs something. She get glucosomine in her dog food as well. The asprin can be hard on old tummies.