IANAL, but I think abandonment kicks in after 30 days, and you are free to do whatever you want with the stuff. Not saying you have to wait 30 days, since he had no legal grounds for being there in the first place- he was a guest. But I think after 30 days you would be safe- I think that's how it works with storage facilities too. MIght be 60 or 90 though.

Good for you for taking care of the animals- they are helpless and innoccent in all this. Try to find them good homes if and when the time comes. Best to you!