We have 2 female cats that have been hanging out in the woods behind our house and coming up on our porch. I'm pretty sure someone dumped them at our house, they are very friendly. We live in a neighborhood and our house is in the back next to a dead end. Our 2 dogs usually chase them off every time they go outside. Are they going to be a problem when I let my chickens out of the run? My chickens are bigger than the cats but I'm still kind of worried.