As you know, I like to put words in my horses' mouths. I've put one possible conversation below. Doc is on the left in all shots.
Pippin: Do to. Your feet smell like Limburger cheese. Hahahaha! You're the stinky cheese horse. Bwahaha!
Doc: Don't you dare call me names. Stop it!
Pippin: I'm sorry....(mumble) I didn't really (mumble) mean it....(mumble) much!
What do you think they were saying?