Because I'm...? No! Of course not!! It's my familiar, there's a magic, mystical bond between us!! It's not just because I'm, because I'm...

[There's a pause, as Papyrus looks at his dog, and the dog looks back, and some kind of nonverbal communication passes between them. It sticks its tongue out and pants agreeably. Papyrus screeches in outrage, even louder than usual.]

At any rate!!! I am not my dog's keeper!!! You can talk to it freely. Demand all the answers you like!