Regarding the Tumeric, google Golden Paste. There is a lot of info out there about it, including recipes. I have used it in the past with a liver compromised dog and my vet approved, but he did not have MVD so definitely check first.
Tramadol is one of the safer pain meds, and should be okay at least short term for a liver compromised dog. But again, it's just something to talk over with your vet.
Maybe it's just my previous bad experience talking, but no way would I put an 8 year old dog on an NSAID, even short term. Actually, I won't let any of my dogs have them, no matter what. It would have to be life or death for me to change my mind and even then it would take some convincing. It is impossible to tell how a dog will react to them, and in some cases even a few doses can cause damage to liver or kidneys.
For a very senior rescue toy poodle I have with bad knees, I use Synovi G3. It's formulated into a chewy little treat that must taste awesome because my dogs gobble it down like crack. He gets 1/2 of a small treat, and my other two younger dogs split the other half just because they love it. He still holds one back leg up for a minute or two occasionally, but it has improved his mobility by at least 75%.
Good luck. I hope you find a solution that works for Tibbe.
Diana |