Chows are listed on most top-ten lists for violent behavious...

8. Chow-Chow
"Somewhat surprising due to their small frame and stature, the Chow-Chow was reported to have been responsible for 8 fatalities in the journal’s study. With an average Chow-Chow weighing about 60 pounds (28 kilograms) and only growing as large as about 20 inches (52 centimeters) the Chow-Chow is unfortunately known to have a very aggressive personality, especially around strangers.

They are usually held as pets, and due to their size they can be kept in apartments. The danger rests when they lack exercise or are just generally bored, and will sometimes lash out at strangers and even owners due to boredom."

Chow chows have attitudes too!