Pekingese
These dogs were initially bred to serve as companions to the royal families in China and are therefore very haughty and posh about themselves. They have a superior attitude around them and can get harsh and even bite if threatened by your actions.
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However, it is said that they are excellent dogs for watching over the house and are trained evolutionarily to not compromise with intruders. They will only make good pets if you plan to invite your enemies over to your home.