I got my Chihuahua about half a year ago, he was already a year old when I got him, and had belonged to two different owners (the first being the breeder). My family... dosn't like small dogs all that much. I hadn't had any expericance with them prior to my mother bringing him home (his previous...

Sparky my 9 week old boxer pup, gets a little more rough with my 6 year old, then any of my other kids. Dom, (6) plays more roughly with him then my other two. I just need some advice on how to handle both of them. Sparks, barks at dom like he is gonna "get him". I tell Dom to get away and...