Give the vet a call and ask him to call you back when he has a minute.
I would stop all supplements, keep his diet as simple as possible. He is a senior at 8 years old, break the piggybank and get some lab work done (if you haven’t done so already).
Lab values tell a lot and can identify ailments in the early stages, when they will respond to treatment. I would stop the raw. Instead, get a quality kibble and gradually mix the cooked beef/rice mixture into it, add a splash of water to meals. Maybe presoak the kibble in H2O if he doesn’t frequent his water bowl. Hope this helps.
Also, http://skeptvet.com/Blog/?s=raw
PS: I would continue the bland diet for your dog, boiled rice and hamburger, until stable.
I would add a splash of water to meals.
