Bad dogs

My granddog, Winston the Wonder Dog, a black-black Pug, hates bad dogs. When I watch Dog Whisperer, he barks at the bad mean dogs and tries to jump up to the television. He gets happy and excited when all the dogs are playing and having fun; he'd like to join in.

But, let a cranky or vicious dog appear, and he will go nuts. I think he is trying to discipline it, to make it behave. He looks back and forth from the t.v. to me, as if confirming his indignation. He seems to want my approval for being such a great dog.