I read the book about a year ago and I recently I was trying to remember the name of the horse for some reason. I also completely blanked on it, and it took me a few minutes.

I'm pretty terrible at remembering details like that. My brain just stores things relatively, like 'the main character's brother', even after reading his name a hundred times.

Anon should have just told his teacher that the horse (rocinante) is nothing compared to Sancho's she-ass.