Wow, what a tail! I'm so glad Clive is back to his old self, even if it seems like a new self to you.

You certainly should be commended on taking him in so quickly, and the vets should be too for doing the blood transfusion and taking it all seriously enough in the first place to catch it right away. And I'm so glad he's purring now too. Sounds like he has certainly found his furever home.