We have a dog. He has free range of most of the yard. The chicken coop is blocked off. But since we have had our dogs the ground hogs, moles (for the most part) skunks, and coons have kept their distance. Our dog is a male, so he marks his territory all the time.
A couple weeks ago a young coon did come onto our property, came within a few feet of our coop, the dog heard it and ended up, in the end, treed it. I even put out golden malrin with eggs (careful where you put this...it will kill anything that eats it within minutes!), and that was out for two days or more....all i caught were flies and I haven't heard anything either. Our dog has great ears!!!