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					Originally Posted by YorkieShadow  My two bark when people come in and bark when they leave. I know they are not aggressive  cause they bark at me going out and get so excited they run to the window and watch me out side barking the whole time. | 
 
  Well sorry I have to say that well it is a behavior that can lead to aggression and or a dog if bigger than a Yorkie going through a window.
It is all in how you see it and 
if you see it as a problem it is, 
if not then it is not. Some find it cute, others not so much.
Jean Donaldsons book. The Culture Clash Understanding the relationship between Humans and Domestic Dogs. 
Was a whole section on dogs and barking as people come and go and how to handle it.  
Joy