The Great Pyrenees is a livestock guardian from the mountains between France and Spain, where big white dogs stayed with flocks and drove off wolves, bears and thieves. Adults weigh roughly 85 to 120 pounds, with a thick white double coat that may carry gray, tan or badger markings, dark almond eyes and a plumed tail.
That guardian past explains the personality: calm and devoted at home, but independent, watchful and inclined to roam and bark after dark. In San Luis Obispo, where the hills around town are leashed open space and the dog park is the one legal place to run off leash, a Pyr's wandering streak and slow response to commands are worth planning for. Expect heavy shedding, and remember that each dog's energy and habits vary.