We are starting out training our dog Buddy and cat Firepaw with the chicks. After a good solid run outside with the dog, and a ferocious romp inside with the cat until they are both exhausted, the dog goes on a leash and the cat is placed outside a fenced off area inside the house. The chicks are let out into the fenced area (By now they are big enough to leap out of the brooder when they see the door open LOL) We give the dog the command to lie down and if he does not do it immediately, we put him on his back. He gets the hint quickly. He lays remaining lying down and he gets rewarded.
At first this was impossible, all he wanted to do was jump up and bark. After a few days he got the idea and and understood the chicks would come around him and he could sniff all he liked. If he displayed anything other than calm behavior he got a swift chuck with the chain collar and a "NO". Tonite he did nothing but sit and sniff and eventually got up and walked off on his own, bored.
We will of course have to repeat this once the chicks begin running around the yard. His chase reflex will kick in. I am confident however that the same firm training will work then. It worked with Buddy and the in laws cat which hadn't a hope in heaven of defending herself. A pint size midget with no claws and no fight.
Firepaw is much more difficult. The chicks and firepaw interact through the fence. When Firepaw feels it necessary to reach out and try to "touch" he gets hissed at, which makes him very unhappy. No water bottle has been necessary yet, just ferocious vigilance. He does eventually get tired of it and walk away. He hasn't touched the brooder since the first day. A hose will be necessary when he and the chicks see each other outside. We have a firehose connection that can be set to low. It will work. I have been thinking of taking up a neighbors offer of putting Firepaw in the vicinity of his rooster who regularly chases neighborhood cats when he sees them.
This is a very slow and laborious process, it involves alot of attention, at least two hours every night and plenty of patience. I'm sure it will be worth it however.