He is strong willed, independent and somewhat reserved
Strong-willed: a more commonly used word is
stubborn. If you are looking for a dog for obedience competition, you dont want a Pyr. Many a Pyr owner has been humiliated in the obedience ring when his perfect at home Pyr decides not to come on the recall, to go over the high jump in only one direction or to lag six feet behind while heeling. However, obedience training is absolutely necessary if only to prove which of you is the more stubborn. It also builds a common language for the two of you, teaching him that he must grant you some degree of control if he wants to go on ride, walks, and have house privileges.
The character of independence is vital for a working dog that spends hours or days alone with the livestock it allows him to make his own decisions based on his experience and best judgment, and not wait for a human to tell him what to do. He also frequently exhibits an independence of a need for a particular human. It is extremely rare for anyone to describe their Pyr as a one-man-dog. Rescue personnel describe Pyrs as easy to re-home they rarely mourn their former owners.
Once past puppy hood, Pyrs are usually somewhat reserved around visitors. They may choose to greet a visitor on their terms, when they are ready to. This is not to be mistaken for shyness, but is rather a lack of attention-seeking behavior. Once introduced, a Pyr will never forget a person; that doesnt mean that person is automatically welcomed, however. Each visitor seems to be subject to an internal checklist before that happens. Out in public, the well-bred Pyr will permit petting by strangers, but never solicits it.
http://sonic.net/~cdlcruz/GPCC/library/temperament.htm (quoted from this link)
ha ha ha! There's the word I was looking for... "stubborn."