From what I understand, they are supposed to be protective of their pack (both other dogs and humans) and socialized like a Guardian breed. Allegedly, because of their pack hunting origins, they think it a matter of survival to protect their pack. And they are said to need strong leadership (read: an occasional ass kicking) or they take over. Could be those dogs just had too gentle handling and lack of socialization or that people are badly breeding them because they aren't so common here. We all know the more rare the breed, the more $$ the pups go for and people are stupid.