@Baxterandbailey – my 12yo male just went through something very similar and he too had diarrhea issues with the rimadyl. He actually had better relief from prednisone than the rimadyl/tramadol combo. He had a sensitive tummy too and does well on Wellness Senior. Also for his stiffness and arthritis, (this may sound crazy) I use a dog-sized dose of horse vitamins my mom uses for her Arabian mares. I just mix it in his food and he loves it. It's called For-a-Flex Joint Support. It is pricey, but it'll last a long time for a dog vs a horse lol.