I have to disagree with you Sara Joy on the LGD. I believe it is more what they are bred for than anything. You either have a dog with good instinct or you don't. My dogs protect the property and what is on it and it doesn't matter if it is a goat or a chicken. They are keeping what belongs safe and what doesn't out. A firm NO! as a puppy will teach them to leave them alone. I've not lost any birds to a dog and I've had lots and lots of puppies around here.
If you shut them up together as youngsters in a small area, you are going to have problems however, because boredom will take over common sense. Once that dog has reached a certain stage of maturity it will understand what to protect. I believe that exposure to things like chicks is the only way for a dog to learn what is okay and what isn't.
My older dogs came from goat stock as puppies but I keep my pups trained to chickens, ducks, and such beginning at birth. A LGD will pounce toward a bird from time to time for fun but a good dog will never grab one. Pyrenees are naturally food aggressive so they may chase the chickens from their food bowl, but the chickens learn equally as fast they aren't going to get hurt and come right back. We will have to agree to disagree on this matter I guess.