I'm 99% sure, had we not traine dmy husbands working dogs, to not eat birds, they'd have wiped our chickens out. (lab/pit mix and a pure bred GSD.)
He used a shock collar to train them. Even our blood hound no longer "mouth hugs" our birds. He loves stuffed animals SOOOO much, never tears them up, but just slobbers on them and hugs them and "which way did he go george, which way did he go" the chickens............. lol
We've caught our blood hound, more than once carrying around a full size chicken, like he does his stuffed animals. He's not trying to hurt them - but they are "real life stuffed animals" and they just make him squee in his little doggy heart.
However, the stress of that, is not good for my poor chickies.