What a great thread! I read through the whole thing -- so many good dogs out there!
Both our dogs -- a beagle mix and a dachshund -- are perfect with our 3 chickens. The birds were in the house as chicks the first 2-3 months, so the dogs got used to to them being around. I would take the chicks out and show them to the dogs and let them sniff them. The dachshund thought at first I was offering him a treat, and would open his mouth for the chick, but the beagle just sniffed. Both dogs were told repeatedly to "Leave it!"
When the chickens moved outdoors, where they have free range of our back yard during the day, I at first would put the dogs out on leads in the yard. I gradually let the beagle mix off the lead under close supervision. The first time he was alone with them -- for just a few minutes -- I came back to find him carrying one of the birds in his mouth. I think the dog STILL remembers the screaming and spanking he got! And I shut him in the garage for half an hour for good measure. (He's normally such a good dog that the yelling and spanking and time-out were very unusual experiences for him, and I think made a big impression.) Fortunately, the bird just got wet feathers. After that, the beagle just always ignores the birds.
The dachshund was the one I was mist worried about, but it turns out his interest in the chickens is only for the little treats they leave for him. Gross, but I'd rather be able to leave the dogs & chickens out together than keep the dog from eating their poop. Oh, well. Now I just let the birds out in the morning & shut them up at night, and the dogs go in & out all day. (My official job description is "dog doorman.")
I agree with the person who said you should show your chickens affection -- pet them, talk to them, feed them from your hand -- and the dogs will get the idea that they're part of the family. OTOH, my dad's dog, a viszla, is so bird-oriented that he chases song bird up in the trees! He tried to tear through the big wire dog cage we kept the chicks in the first time he saw them in the kitchen. I still only allow him out in the yard on a 6-foot leash at "heel" when the birds are out.