[Maybe he's looking for some answer like sculpture, intricate swordplay, or something that would actually contribute to good dexterity. All-in-all, Henry laughs at the question.]

Aww, shucks. You'll make me blush. Nothing that makes me good at petting, though. I'm just a natural! The most I do with my hands is draw sigils or leaf through dark tomes, so unless that contributes to being a master ear-scratcher, that's all me.