The Pyr is part of the Livestock Guardian Group of dogs. It is the mellowest in temperament of the LGD's. My breed, the Komondor, is also a LGD, but a bit more intense.
Even though they are the mellowest of the group, I would definitely do some research on the LGD and see if it is a dog you can live with. They do have some unique characteristics as a group. I would never live without a LGD, but they are definitely not a dog for everybody. They were bred first and foremost as guard dogs and you always have to remember that. An LGD requires socialization as a puppy, obedience training to keep them safe and a strong owner. The most important thing to know about an LGD is that they are not the people pleasers such as a lab. They do not look to the owner for instruction, nor were they bred to please man. They were bred to make independent decisions while out in the field with livestock. This independent thinking makes them a different sort of challenge to obedience train. They are not your best obedience breeds. It can be done, it just takes patience and an understanding of how the breed thinks.
Again, the pyr is the mildest of the LGDs, so many of the LGD traits are not as prominent as some of the other breeds. It is a great breed to introduce yourself to LGD's.
A good place to start your research is
the Pyr National Breed Club Page.
Here is part of the page "Is This Breed For You"
You've seen these big, beautiful white dogs. You're impressed, naturally. You think you want one. This is understandable. But . . . is this the breed for you? They are not the ideal pet for everyone!
The mature, sedate Great Pyrenees which you have seen did not just materialize suddenly. It grew from a cuddly, lovable ball of fluff which at 8-12 weeks of age is most captivating. From puppyhood to adulthood is a great distance and a considerable time. As a breed they are remarkably healthy and long lived. They have few major genetic problems and usually live to be 10-12 years old.
Pyrs combine a great intelligence with a deep devotion to family and home, and a natural-born instinct to guard and protect. While trustworthy, affectionate, gentle and tractable, they can become, when and if the need arises, protective guardians of their family and their territory. Thus, they command respect as watch dogs as well as admiration as pets.
Adult Pyrs are placid by nature and calm in the house, enjoying quiet periods in which to rest and sleep. But they are a large breed and as such are not always suited to life in a small apartment or urban setting with little yard space and lots of activity around. They want their life to be consistent and predictable.
The addition of a dog to your family is a major decision and deserves a great deal of time and thought. A Great Pyrenees is placid by nature, so despite their size, they are excellent house dogs. Yes, an adult Pyr is a beautiful, calm dog, but there are other considerations-have you thought of these?
Considerations
Are you physically able to handle a very large dog? Basically gentle, they are strong, and during the phases of puppyhood can be a real challenge.
Does dog hair around the house bother you? If so, forget the Pyrenees. While with routine grooming they are not much different than any other breed, they do shed and there are white hairs in Pyr homes and on Pyr people.
A Pyr needs love and attention on a daily basis. Are you and your family able to provide this? A lonesome Pyr is a bored dog, and a bored dog can become destructive.
Great Pyrenees are at heart guard dogs and members of the great family of livestock guardian dogs. As such, they share with them certain strong characteristics. Pyrs were bred to be left alone with the sheep up in the mountain valleys. They are a guard dog by instinct, not by training. Their basic personality is different from most breeds, since most breeds were bred to take commands from people, while Pyrs were bred to work on their own.
A Great Pyrenees is an intelligent, sometimes willful animal. They have minds of their own and are not easily obedience trained. Things that you consider important may not be the same things your Pyrenees considers important. Many are almost cat-like, in their independence.
If you require a dog who will be a great "off-leash" companion for your outdoor activities, if you want a dog who will follow your every command, or if you want a competition obedience dog, the Pyrenees is probably not for you.
Do you have room for a Pyr? They are large and must be confined in a well fenced area, or they will exercise their powerful instinct to establish and patrol a large territory. When out of the fence they must be kept on lead at all times.
Like all livestock guardian breeds, Great Pyrenees are barkers, especially at night. The amount of barking varies from individual to individual, but the instinct is there and in some cases can cause major problems. Most Great Pyrenees in urban or suburban settings must be kept indoors at night.
The Great Pyrenees is a guard dog and as such cannot be expected to welcome uninvited intrusions onto your property. They will accept anyone whom you invite into your home. They are not "attack" dogs, but can be very intimidating to the surprised visitor. It is an owner's obligation to maintain a Great Pyrenees so that his guarding instincts can be exercised in a responsible way.
These are things to think about. If you find you've answered them honestly and still want a Pyr, here are some suggestions as to how you should choose your puppy.