[scone]

My male yorkie just turned one year old. He was the sweetest puppy but now has odd behaviors. The most scary is that he will run out the door or run away if we turn our attention away for a moment and he will run after people and kids aggressively, snapping and barking and lunging.

I thought this was territorial but when people enter our house he barks when he hears the door but my kids get excited too, so that explains that, and when people walk in our home he jumps on them for attention but in a friendly way.

He's only aggressive to people passing by our house and get this--he will run up to houses and bark at the door until someone comes out to see what this whacky cute dog is barking out and when they come out of their house he will corner them snapping.

Usually, when we hear the ruckus we know where he is but I'm afraid one day he'll either bite someone or get himself hurt --he also has no qualms about running into traffic to bark at cars.

Anyone have suggestions on why he does this?

Thanks!