We love our dogs, but it is true that they are predators of all prey animals. Family dogs kill by using the chickens as toys. They will either run them to death or bite them in play.
I have a Rat Terrier; they are extremely prey driven. Which is why I brought her into the family. We suddenly started to have problems with rats on the property. Her training began immediately when she arrived. You see, I know animals can learn to turn off certain instincts when they conflict with taught behaviors. Having said that, she is still an animal and if I am not present to reinforce desired behaviors, she can revert to instinct.
She has been taught not to respond to the chickens, with a hand bite from me, followed by a hand signal (the letter C). When I see her looking at the chickens longingly, I get her attention, then use the hand signal. And I use my facial expression and energy to let her know that I mean business. I sit in a low beach chair still today, and watch my chickens. This lets her know that the chickens are mine. If she seeks attention from me, I look away from her and focus on the chickens. She is here to work, so part of her training involved inspecting the chicken pens for rats, she also checks the cars. When she finds a rat, we let her go at it. She seems to understand that the rats don't belong in our family, but the chickens do. Again, having said that, she is an animal. So continual behavior checks and reinforcement will always be necessary.
She gets plenty of love and affection from my husband, and her work duties are from me. And when she does a good job, she gets attention and petted by me. Then, its back to work. Because I understand her prey drive instincts, this is how she must be handled. It will be my failure not the dogs if she kills a chicken. When I let the chickens out she sits with me and watches for a while. Then goes off to patrol the perimeter fence. Sometimes she will sniff a chicken as it walks close by, then she gets the hand signal. I can tell by the way she lifts her head and her eyes scan the yard while the chickens are out, that she feels confident and has purpose at that moment.
It's a lot of work, but it can be done. My "Raddy" is also deaf. So if she can learn your dog too, can learn.
God Bless