I had to clean up some regurgitated rat in my bedroom once. Clyde usually won't eat rats after he kills them, but if he does, he can't keep them down. I had to leave the room to regain my composure a couple of times before I was able to clean it up. The smell was amazing. It looked like a haggis, or a blood pudding, or some sort of other nasty sort of thing that the Brits eat that is stuffed into the entrails of some large mammal or another.
He has no trouble digesting mice or birds. He doesn't seem to eat the chipmunks after he kills them.