I have cat hoarding neighbors. It can be a real problem. Feces. Hair. Mice (read: flies). Also, I have a son with a flea allergy. A cat or two never bothers me

I have cat hoarding neighbors. It can be a real problem. Feces. Hair. Mice (read: flies). Also, I have a son with a flea allergy. A cat or two never bothers me. But when my neighbor gets to putting out 5 or 6 food dishes for the strays each Spring, we can easily find a dozen cats in our back yard.