No, dogs are never too old to re-train, however, there are some bad habits that are much more difficult to correct than others. Let's address the problems one at a time. I don't know whether or not chicken killing is a habit that can be broken or not. Usually, when a dog, (or any carnivore, for that matter) tastes blood for the first time, they are usually hooked. The only solution to the killing of chickens may be to keep her away from them, or find her a home where there are no chickens. As for bringing the dog into your home, with your fairly young dog, I think that you will have your hands full, and then some, trying to train both. That being said, I don't think it is impossible, but I do think that it will be very time consuming and difficult, it all depends on how much time you have to spend with them, and how committed you are to making it work. Will it set your current dog back in training...maybe, again, depends on the time and commitment you can put into the task. It may be necessary to bring in a professional dog trainor or behaviorist to help in the task of "untraining Daisy". The best thing for Daisy might be to call the animal shelter, or police department, and lodge a complaint, and get her to a new home that she can be loved and trained without having to be in a multiple dog home, far away from chickens. Whatever you choose to do, I would do it fairly quickly, as the quicker she is removed from this situation that she is in now, the better. Every day is adding more to the matter of re-training her. Good luck, and let us know how things turn out!
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Yay for daisy! 
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