japanese chin
These adorable dogs were originally bred as companion dogs for royals, so it's understandable that they demand affection from their owners. Make sure you don't pamper your Chin too much, as he will feel like he is the master. They are also known for being very jealous little ones.
Shih Tzu
Shih Tzus get overexcited and scared very easily. When children play rough or sneak up behind them, they can become mean and bite. Shih Tzus also develop separation anxiety when left alone for too long, so it is best if their owners are retired or work from home.