We're getting a Great Pyrenees puppy at the end of the month. I'm a veterinary technician so I'm very familiar with raising a puppy and all that goes into it but I'm not too familiar with having a livestock guardian dog specifically. Right now our small flock does not free range at all but I'd like to let them eventually. The dog will be on an invisible fence eventually as we have 10 acres and a traditional fence is not feasible. Will he sort of herd the chickens and keep them in the area he's allow in? What age can we reasonably expect him to do his job?