I posted on the Buckeye thread in the Breeding section how I fixed our chicken killer/potential chicken killers. One was a Beagle we adopted because she was a chicken killer, one a rescued lab cross trainedto hunt birds, and my two--Rhodesian cross and a Dalmation 'city' raised dogs.
It wasn't hard, took total maybe an hour and it's been three years and we haven't had a dog/chicken incident. Our chickens free range the farm, and the dogs are out all day and night with them.
found it:
Not to get too far off topic, but we have 4 dogs. Two outside (Beagle and a Lab mix we hunt pheasants with) and two inside (Dalmation and Rhodesian/German Shepard mix) at night/outside most of the day. The Beagle was a rescue because she was a chicken killer as was going to be shot by her former owners. We decided to get chickens a few years down the road, and sure enough she killed one that got out of it's enclosure.
I saw an episode of the Dog Whisperer (I know some don't agree with his methods, including me sometimes.). I did what he did on the show, and it worked! Our chickens are now free range on the farm and we haven't had a death since training. It took just under an hour to train all four dogs. I spent 30 minutes of that with the Beagle--stubborn dog, but that was it.
Basically you get them in the calm/submissive state (I asked for down and made them stay.) Then presented them with a chicken (one of our clamer 'pet' roos). The chicken was scared out of it's mind, but didn't run away, it just walked around me. When a dog would start to get excited, I put two fingers on the side of their necks and made the 'shssst' noise. They calmed right down, and after a couple of minutes I let them up and they walked away totally not interested in the bird. In fact, they actively avoid the chickens now.
I did 3 dogs at the same time, and let them go when they could maintain the calm state with the chicken present. The Beagle screamed and threw a fit for about 20 mintues--but all I ever used was the two fingers and the noise. It took her another 10 to submit and relax--I think part of the reason it took so long was that she had no previous training (no sit, no stay, ect.).
Anyway, I think most dogs could be rehabilitated. I'm sure there's exceptions to every rule, but ours responded very well.