To me, that dog actually looks like he was caught in the act. He's panting, which means that he'd just been really active. And he's got his ears back, which is usually a dog sign of deferral or whatever.
I could just imagine him saying, "Tara! OH HEY, GIRL! Um, torn duvet? What do you mean? Oh thaaaaaaaaaaaaaaaaaaaat duvet. Right. I don't know anything about it."