Originally Posted by lurkette

Remember that calm and quiet are largely a factor of having a dominant owner who doesn't let the dog think it's in charge. If the dog doesn't know that you are the alpha, and are in charge of protecting the pack, they're going to do it for you, which means barking and being neurotic and possibly aggressive. A lot of people neglect this with smaller dogs, treating them like toys rather than like canines - they're still pack animals and still ruled by doggie evolutionary forces. You still have to be firm and in charge with them.

Good luck!