She got loose once and went after the neighbour's ducks. They got away, but I was hopping mad at her. I took her over there on a leash with the collar on, and right as she lunged for them I nailed her with full power. I'm pretty sure she spun around in mid air and tried to bolt back to the house---she's behaved a bit better ever since then. I need to do that again, maybe it would sink something in a bit deeper.I believe that positive reinforcement is great.... but in situations like this, where they'll rip apart chickens, you want to create avoidant behaviors. You literally need to associate a very unpleasant reaction, with their fixation, or nothing will ever stop them.
I've worked with a lot of hard core working dogs, and I hate that most trainers don't respect or even understand how to use tools. You can't proof a dog with out being open to using a wider variety of training methods, especially high energy working dogs, or dogs who have issues with other animals. Especially if they have a high prey drive.
My husband has his dogs so fixated on their reward for working now, the work itself was also created to be the fun part, and then at the end, they get their ball. He created a very big ball possession drive, where you nearly have to choke them out to get their ball back, but because of it, they can go anywhere, around anything, and if their reward ball is in their mouth, there's nothing that will make them drop it. Not even the desire to taste a chicken, too. LOL
However, I have a strict rule. If a dog eats my chickens, it can't live here. So he made sure his dogs wouldn't eat a chicken. haha
Birds in general drive her nuts. Songbirds, parakeets, chickens, ducks... Oh, and cats too.