And another one. I have a recently adopted chihuahua (again about 4 months ago). He is eight years old, and a very good boy. Outside he is very prey driven, not a huge problem, because my Eskie also is, so I am used to it. But, if Taz cannot get to whatever has caught his attention (most of the time it is a cat) he will "attack" any animal that is near him (my Eskie or one of the other dogs we are walking with). How do I make him stop doing this? We are in behavior classes now to work on better socialization skills and focusing on me, there has been some improvement, but to be honest not that much.