[The dog barks cheerfully when he's acknowledged. It's a little different, Caesar notes—it's been a while since Kogoro's actually interacted with any other animals, and the bark is clearly directed toward Donatello. Not just at him, but to him. Interesting.]

Anything you are willing to. As long as it's not any trouble. I've read a few things, but otherwise, I don't know very much about training an animal.