I have 5 dogs, all different breeds/muts. They are not in the same pen as my deer, but are one fence over, and all can see each other. When they bark at the horses, or at strange cars, or whatever, the deer don't really pay any attention. The deer know my dogs, and pretty much ignore them. I can tell when a strange/stray dog is on the property beacuse they go on alert, on point, looking, at attention, snorting and stomping, but they don't bolt. I can see the body language of the deer and know that an unfamiliar animal or person is on the property. They are like another type of alarm system!