Our chicken got out of her fenced area, when my daughter was out there getting the eggs. She told them to leave it alone, and they ignored her. The chase was just too much for them. They'd never intentionally tried to get through the fences to get to a chicken... but once it was out, it was fair game. My daughter wants a dog who won't harm a chicken, even if it "gets" out on accident.We have seven dogs. A 12 year old Pomeranian, Greyhound/Lab mix, Anatolian, two Boxer/Bulls, Shelty, and a German Shorthaired Pointer. They have ONLY at fence access to our chickens, ducks and geese. They are VERY interested in the birds but don't charge or attack the fence. We would NEVER allow them to come in contact simply because we don't want to find out what they would really do. We love our dogs and our birds and part of us being responsible is to keep them apart. The dogs discourage critter visits from a distance unless the critter comes into the actual yard and that in turn helps to keep the birds safe. The yard around our house, where the dogs have free access, is about an acre. The birds have free range on three acres. Everyone seems happy with this arrangement.