Feeding pets outdoors will attract skunks, raccoons, opossums, armadillos, foxes, deer, and other animals TBD. Mrs. Nalt has actually fed the wildlife mentioned for 21 years since we moved into the house we built. I told her for several years that she needed to stop before she wound up getting bitten by one of them. Then about 5 or 6 years ago she came in the house and showed me where she was bitten by a baby raccoon. She had to endure the series of rabies shots for about three rounds. She still feeds them...
Now, my contribution to the original question... Fleas. I don't mean those sand fleas at the beach, I mean fleas that dogs, cats, skunks, raccoons, opossums, foxes, deer carry. When fleas get into your house it is equally difficult to get rid of them as any other creature except maybe the brown recluse spiders...