Gosh, what great ideas! I wish I had referred to this site when dealing with our lab and new chicks. However, we've had recent success and have officially declared Tucker a certified chicken dog! Here's what worked for us....
Set up baby chicks in brooder in the house and tried to let the dog see them in our hands, sniff them, etc.
Too much for his predatory instincts...wanted to "chomp" them and trembled with nervousness.
Now we decided he may not pay ANY attention to the brooder box, and give him a sharp "leave it"if he showed any excitable interest.
Then we graduated to this step..
If he passed the brooder with a CASUAL glance....then he would get an IMMEDIATE treat from my pocket.
When the chicks outgrew their box, I moved them to a pen in the house. Every time I tended the chicks, he came with. This was still very hard for him, and at this point I realized the importance of paying CLOSE attention to his body language, subtleties in facial expression, ears and eyes. I would make him sit every time we were around the chicks and allowed NO staring!
At this point, saying "leave it" was not enough, even though he tried very hard to be calm. So I started using a shaker can. This is an empty soda can filled with enough pennies to make a horrible racket when you give it a shake. Doing this at just the right moment is the key!
I used this method with the chicks loose outside and the dog on leash. However, he knew I was the one in control of the shaker can noise and even though we were making a lot of progress, I was beginning to have my doubts about Tucker ever being able to not chase them, and possibly kill one.
Then one day just over a week ago, ( my chickens are about 14 weeks ), we were out in the yard on leash with the young chickens loose. Well a couple of them tripped over a shaker can that was on the ground. The sound of it coming from THEM is what finally worked!! He wanted to go in the house right away and have nothing to do with them.
Now, when I let the chickens out for awhile, I stick a shaker can near the chickens just to remind the dog that they know how to detonate it, and all is harmonious between.
I wish I could say I thought of this trick, but never the less, it really worked great for us.
The bottom line is, you must be on this training very diligently no matter what course you take. Summon lots of patience, and try hard to never to be angry with your dogs for doing what their instincts tell them. ( I had to fight this a couple times. ) In the end, if it becomes to much of a strain on them to resist the urge to chase, you can still have chickens in their pen and enjoy wonderful fresh eggs.
Good Luck! keep us posted!