To be honest with the way that Deaton was helping Gabe take care of the puppy, letting him name it and everything... he'd figured that the vet had given the boy the puppy. That's what he'd gotten from all the interactions. So he can't help but frown because if that wasn't the case... Then why let his kid get attached?

"Right, of course," he says with a bit of a frown. He's actually kind of upset with the vet for letting that happen. "I guess we could." Even if he'd rather take the puppy home with him when him and Gabe go back to his place.