[Sans's attention is pulled away from the dog when Papyrus starts using bone magic. Again, just a feeling, but a familiar one. Skeletons and bone magic go together, so maybe it's not that surprising, but--the pattern--
Wait, right, the dog. The dog is giving him a look. ...Is this dog trying to extort him? Sans kind of appreciates the ingenuity? But there is only one kind of food Sans is carrying on him: (monster) ketchup. Do dogs like ketchup? Sans holds up the bottle. He will absolutely squirt ketchup into this dog's mouth, that's a normal thing to do.]
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Wait, right, the dog. The dog is giving him a look. ...Is this dog trying to extort him? Sans kind of appreciates the ingenuity? But there is only one kind of food Sans is carrying on him: (monster) ketchup. Do dogs like ketchup? Sans holds up the bottle. He will absolutely squirt ketchup into this dog's mouth, that's a normal thing to do.]