In two days I've lost 4 of my 15 chickens to foxes/coyotes. My husband and I are in the market for a Guardian Dog for the Chickens, and future livestock (read pigs), and all around property guard for intruders as it will be our alarm system. We have two boys, 3 and 5, so kid friendly is a must. Having said that, I have been researching and reading all of the vast amounts of threads saying Pyr's are the way to go, but realistically, we live on a 6.3acre plot of land that is approx. 2 acres wide, with neighbors on either side. Aesthetically fencing my whole cleared property is not an option, but neither is having a roaming dog. We currently have an 11yr old Labrador Retriever with a very high prey drive that I would absolutely never EVER trust around my chickens. When let out she stays in a 20ft x 45ft chain linked fenced area that the previous owners installed off of my back door because the foxes were harassing their smaller dog. I would optimally like to install an invisible fence for the guardian dog. I've read of those who say it's not the breed but the training and personality. I do agree with this, but I need some recommendations that will accommodate our family/acreage, not break through the invisible fence, and roam 5 miles up the road and imprint on the sheep and goats there. I'm looking for a good mixture of guardian and companion for my kids, with a relatively longer lifespan that isn't apt to roam. I'm not expecting the dog to take to our chickens over night, and understand that no matter the breed extensive training will be the forefront of a successful working/guarding relationship. This run will also have a roof installed. Suggestions for fortification are welcome. The run is reinforced with 1" x2" welded wire and hardware cloth added to lower 4ft.