I have decided to get a puppy. An Argentine Dogo. This is my first time selecting a pure bred and I am not sure what to look for. I hear talk about top line, bone structure, bite, etc, but have no idea how to identify what is good or bad. I know many characteristics are breed specific, but I was hoping if I posted up some pics, you guys could help me picking out some features, and any thing you see good or bad on this puppy. He is 7 weeks in these pictures.