Hi all! I own 2 dogs. A Labrador Retriever and a German Shorthaired Pointer. They are both males and the GSP is 5 months old and the Lab is 6 months old. They have killed 4 chickens now and are very aggressive about it. They think its a game and they play tug of war with them. One day in just 10 minutes of being outside they killed 3 chickens. We discipline them and they still wont stop. It's to the point where we cant let them outside. They have a cage and a kennel but they are high energy dogs and can't be cramped in there all the time. Our chickens free range and we can't put up a fence. We are considering selling them, but I would like to see if there are any suggestions on breaking them from this. Thanks!