I have 2 dog that are Lab spanial mix. They look like labs but are small like a spanial. We got hese dogs when they were 3 months old before they went to tht ekill shelter. They were fine when they were little but once they got older they would chase anything and kill anything they could catch. They live outside and are in a big yard, abot 100 by 100 and they run and play all day and are happy dogs. They have caught birds out of thin air as they flew past, squirrels have been killed, snakes. Ive found a few turtles they have chewed on round the rim and they have also had someones cat that jumped the fence. That was the last time the cat did that. They have dug under my fence to get to the ducks. Its funny, they dont bother my Pekins or Runners, they run to the fence every now and then and bark at them but in general dont bother them. When I came home with 9 Khakis my dogs went balistic, dug under the fence and also the hot wire..yes they have hot wire top, middle and bottom but got thru it to the ducks. They didnt kill the ducks because I got out here in time but that was 1 reason I had to get rid of the Khakis. My dogs are well fed, socialised with humans, they are my yard dogs yes and will bark if anyone but as soon as you speak to them the bark dissapears and the tail starts a waggin...Dogs will be dogs tho and if they have killed once they will do it again.