I have 2 neutered female dogs and am in the process of acclimating them to the chickens and vice versa. It's not easy, especially if you have a breed that traditionally hunts.
Both of my dogs are mutts adopted from the city shelter. The larger one that I *think* is a mix of german shepherd dog/lab/pit bull was the one I thought would be the biggest problem. She has a very well developed prey drive and has killed sparrows, garter snakes, and mice. She also lives to catch squirrels, and even regularly jumps into one of the trees to get at them. However, she caught on very quickly that the chickens were NOT to be messed with. I can have her on a very loose leash while the chickens are in the yard, and she doesn't bother them at all. (Now, the fact that she wants to roll in their droppings is another issue!)
The other dog is a fox terrier/beagle mix. She is usually our "best" dog because she is quick to obey commands. But she just can't seem to control herself around the chickens. She lunges at them, barks at them, tries to get her mouth on them, and sits watching them whining the entire time. I may as well be just trying to teach her basic obedience while she is around the chickens, as she completely ignores my commands. Treats? Not interested; she just wants the chickens. I can't trust her anywhere near the chickens now, and perhaps never.
Luckily, I can block off half the yard so the chickens stay one side and the dogs on the other. It's not ideal, but I plan to continue working with them and hopefully all will coexist fairly peacefully one day.