Cindy called and said Kirby felt bad about what he did and would like to take Gus for a walk. I said fine, especially because I was tied up with the QU class.
When they arrived Cindy handed me a bag of homemade doggy treats. She'd gone to the craft show and bought them, replacing the ones that Kirby ate with gusto. So now he'll still get his Christmas present from Gus. :) Thanks, Cindy. And thanks, Kirby.