I used to have a roommate who left out cat food for neighborhood strays. I finally talked him into stopping that practice after the one pre-dawn morning I went out to the porch and almost stepped on a possum who’d come to the buffet.
I’m tempted to plant a flower bed with catnip. I’d like the neighborhood strays to keep the squirrels at bay, but I don’t want to attract them with food, because I want them hungry.
Global, another problem using dogs to kill rats is that most rats can climb. One night in Louisiana, the dogs started raising a ruckus and I turned on the light in the courtyard and saw 5 rats lined up like Rockettes about 5 feet up a brick wall. That's when the pellet rifle came out.