People like the one you dealt with are simply creeps. I've taken dogs that were run over from the side of the road, put them in my car's trunk, and driven them to the vet for treatment. Without fail, I've always had to find a home for them too because when I learned who the owner was, called them, the owners denied being the owner. Duh, the first clue that the owner gives a rat's tail is that the dog is running loose where it can be run over.