We got a golden retriever puppy last summer who has turned into my birds' worst nightmare. She's a super sweet dog, intelligent, eager to please, super playful. I have 3 other dogs and have trained them all to coexist peacefully. I even had them all stay together in the chicken pen last summer when we went out of town! But this dog - she's killing my birds! I know she's a retriever, does anyone have any advice about how to train her to just stop already? I do keep the birds penned now, but they were so used to free ranging, they can fly out pretty easily.