Oh, gross. I hate it when things like that happen. Either introduce it as a thing or don't introduce it if you're not going to work with it properly. That's a big thing to introduce, too.

If you want to bring in the animal blood, Caroline can take him under her wing and do what Stefan did for her. Teach him the ways of the bunny? I know Caroline's trying to avoid being a vampire and this will make her confront her little issues.