I have 10 dogs-6 Alaskan Malamutes (who would kill my chickens if given the chance), 1 Alaskan Husky (ditto the Malamutes), an English Setter (who will point at the birds and trap any loose chickens until i can catch them but does not guard them) and my 2 Great Pyrenees.
The Prys are great with the chickens. The older one I got when she was 8 months old. Her first 8 weeks of life was spent with mom, dad and a herd of 300 Boer goats, then she went to live in a house with no other animals. The younger one came form the same farm but was raised inside a house until i got her at 8 weeks of age. She has learned that the chickens are mine, and she does protect them. The older one protects the protects the property, which also protects the chickens.