So I have a 7, almost 8 month old puppy, who is half Lab, half German shepherd. She has gotten very bad with our chickens. She used to try to chase them to play, but recently she has really been stalking and hunting them. She crouches low and then pounces. She has removed some feathers and today she even cut the top of one of my amberlink pullets head. She is always outside on a 30ft leash, so she doesn't have full range of the backyard. However, everytime the chickens come close in her proximity, she hunts them. She gets reprimanded harshly and locked in her kennel for a few min everytime she does it, but I am very concerned about my peeps. I love them so much, but don't want any of them to get seriously injured. I'm wondering, can I train her out of this prey drive? Is it hopeless, or is there still time since she is a puppy?