Ok, these are the dogs I have or have had.
Boston Terrier - Chicken Friend
Bulldog - Chicken Ignorer
Doberman - Chicken Ignorer
French Bulldog - Chicken Killer (very strong prey drive for anything with feathers or small and squeaky!)
Yorkie - Chicken Killer (my mom's dog, another dog with strong prey drive, even at 8, she still catches chipmunks, birds out of the air, chickens when she was here and one made the mistake of flying over the fence, etc)
Maremma - Questionable/Maybe - Remi is only 9 months and is mainly in with our goats, I would bring him out to feed him and the muscovies would be feeding nearby with no problems. Then one day some couple of young chickens slipped into his pasture, probably about 2 months old and he killed them. To be honest, I think he was playing with them, that is what it looked like. We are working on that. Since he is a livestock guardian breed, I think with more training and maturity, he will be fine.