I have a 2 year old Pyr that is a total house dog. He is great with my family and neighborhood kids. He isn't destructive in the house. However, I have a fenced yard he runs in and I make sure to take him on long walks daily to get out his energy.
He was not from parents raised as working dogs, and he has no interest in guarding chickens.
I understand people's apprehensions. But if you're willing to put up a fence, give him lots of exercise, and focus on training; give it some thought. My Pyr is the best dog I've ever had.