For perspective, we have 10 acres of land, with just about 5 of it that the dog will be patrolling around. My chickens will be in a predator proof run, however my goats and mini pigs are not. So the dog's main charges will be those. I just don't want the dog trying to charge the fenced area where the chickens will be. I'm more inclined to get the heeler if they are able to be trained not to chase the chickens at the fence. Our main predator is coyotes, so I want a dog that will chase them out of the yard.