I don't know what to suggest. Having chickens in the house where the dog will always be, makes it more difficult. If they were in a chicken coop and had a secure run it would be much different, you could gradually increase your dogs exposure to them.
Maybe BYCERS on the "people with house chickens," thread would have suggestions.
My friend has 3 bantam house pet chickens- and has an elderly Peke-a-Poo dog that pretty much ignores them. He has been around years of house chickens. My friend did say that when he was a pup he pulled out some chicken tail feathers and she hollered at him so much, he never did it again.
He tolerates the chickens stealing food from his dish, hiding his dog toys & treats, and sticking close to him like a shadow , when in the back yard. Oh yes, nearly forgot they often kick him out of his dog bed.