I just wanted to thank you for doing the right thing. After I left my ex (also a vet w/ every possible resource at his fingertips) he just kept finding new enablers. I wish that more of them had as much compassion as you do, and weren't so willing to contribute to the progression of his disease.
Enabling is not helpful or compassionate. You are doing the healthiest and kindest thing, not just for yourself, but for your friend.