"That's a lot of belief for someone you just met. But I'll try." If Caduceus actually recognizes sarcasm, he may not practice it in return.

He steadies himself and looks down at the dog. "All right, come on, friend, you don't need to put up such a fuss. You're fine and you should probably go back home."

Perhaps because Caduceus isn't yelling back at the dog or it's because of his calming, deep voice, the dog kind of pauses its barking tirade and sits down.

"There you are. Go on home."

Apparently satisfied with defending the homefront, the dog wanders off.