Great Pyrenees were developed to guard flocks in the mountains between France and Spain, which explains the thick white double coat, the steady calm and the habit of working through the night. That history shows up in Peoria as a dog that patrols its yard, barks at things you can't see and decides for itself whether a command is worth following.
Adults commonly weigh 85 to 120 pounds, so plan for a big dog's food, medications and bedding, and for white hair on everything. Pyrs are usually gentle with their families but reserved with strangers, and many wander if a fence has a weak spot. Training works best when it's patient and reward-based. Pyr mixes are common too, so a dog's size, coat and energy can differ from the standard.