You can give your dog the pink pepto (liquid form) in very small doses call and ask your vet, they should be able to let you know how much to give him, it depends on his weight. Dont give him too much. Good luck
Sometimes a little cooked rice mixed with chopped meat helps. Still, it will not be long and the dog will get over it. However, next time you administer aspirin to your dog, use the coated aspirin....
Cooked plain white rice, absorbs stomach acid, easy to digest and will settle the stomach. If the dog won't eat it, try adding a litte bit of scrambled egg. Works every time.