I just recently got chickens and I have a 15 year old terrier who, as far as I know, has never seen a chicken before. I spent a lot of time with her while holding the baby chicks and letting her smell them when they were young. Now they are 6 months old and quite big for her to want to mess with, but I also STILL sit on the ground and give the chicks some scratch out of my hand while having her lay next to me and feeding her small treats like bits of ham or training treats. I'm trying to teach her that good things come when she is near the chickens. So far so good, but just stay close to your doggie while she is interacting with them and don't let her chase them. As they get bigger they will teach her some manners especially if they are used to seeing her and growing up with her. I have found that my chickens are much more interested in my dog than she is in them now.
good luck.
ditto