Mine free range all day, and only twice has a bird (the same one) not come back to the coop at night. She was there in the morning though, waiting patiently by the pop door. I have two coops, and although the birds are out all day together and in and out of both coops they go faithfully to the "right" coop at night (the one they went to right out of the brooder) My dog is a lab/beagle mix and she could not pay less attention to the chickens, she totally ignores them. My outside cat, who hunts ferociously and is always leaving bits and pieces of mice and squirrels (sp) for me on the walkway is in no way interested in the chickens as prey. She loves to lay in their dustbath spots, and on top of the rails of the run, and under their bushes and in and out of the coops but just watches them. Somehow, she has figured out that they are not for her. We are out of the city, but not really country, and although I know there are raccoons and such, so far we have seen no sign of them. Knock on wood.