We have our land divided into three pens, each with 5' fence surrounding it. The birds free range inside each of the respective pens (some birds free disregard the pens completley, and go where they want). We are going to get a livestock dog. How have you all worked your pens / fencing to allow the dog access to the entire property? The pens are stacked, two of the fences are "internal", I was thinking of putting "doggy doors" into the fencing. Would the dog be smart enough, and the chickens and turkeys not smart enough to use those? Will the dog need access outside the pens too? We are on 4.5 acres, with a small house, and about 2 acres of fenced in pens.