I have a little rat dog (Chaweenie) that looks like a min pin... I'm more of a big dog person, but I got him because my brother was going to put him down for being aggressive when that's the way they raised him. He wasn't really aggressive, he was scared of his own shadow and would rather run from you, but when you insisted on getting close to him he would lunge and bite. Took me about a month to get him to let me treat him like a normal dog and close to a year before he stopped freaking out if you tripped over him or he knocked something over and it fell toward him. I couldn't even touch him for a week or 2 and he would start snarling and putting hackles up if you got within about 10 feet... Now, he cuddles, rough houses, rides in the car, we made him a raft so he can go to the river with us without having to get wet.... Wasn't anything wrong with the dog that a little training couldn't fix...