So this is my story and I dont know if it will help, but maybe.......
I got this BEAUTIFUL dog from the pound in December. I went there looking, and saw this sweet blue merle Shepherd cross.
Think part heeler maybe. Well, we visited him for a minute, and he seems just the right amount of submissive and had some manners. Im very firm and dominant with my dogs and they follow me everywhere like my little pack. I can usually give commands with a look. Guess it comes with owning a zoo for my whole life.
Anyway, long story short, he was killing my chickens and would not listen to me yelling once he gave chase. I caught him in the act and pinned him down yelling NO! and then would catch the chicken that he was chasing and would put it in front of his face Telling him NO!! NO!! until he submitted and was relaxed. I would let him get up and grab a chicken and come to him with it and if he got excited I would pin him down with the chicken by his face until he was relaxed and uninterested again. It didnt help.
Then I got home one day and he had killed my only female guinea and my favorite tame black star hen (all the big birds are free range). The black star was still alive, missing skin and most of her feathers. I had to finish her. Then I took her body and beat the crap out of the dog with her. I heard from an old farmer to tie dead chickens to the dog and let them rot off and that they would never touch a chicken again. Well.....I was out of ideas so---I tried it. I took some haystring and tied the dead birds close to his collar. I left him outside in the weather like that for three days. It was getting pretty gross and he looked REALLY remorseful. On the third day I cut them off and burned them and gave him a good bath. He wont even LOOK at a chicken now and wont even go in the building/coop. They are all still free range with the coop door open all summer and I haven't had a problem since then. If I pick up a chicken he looks away and lays down. I didn't think this would work when I heard of it, but maybe it will help! I can understand if you think its gross, but I was at the last straw....and it worked for us!
ALSO--I tried the 10x10 chain link dog kennel and he DESTROYED it. Dug and pulled and put big holes in the chain link. He only weighs 40 lbs, but it was enough I guess. I even reinforced it with hardwire cloth around the bottom and he tore it off.