Have you read The Amazing Maurice and his Educated Rodents by Terry Pratchett? Its hero, the titular Maurice, has decided that he won't eat rat that can talk. His conscience is haunted by the one time that he ate a talking rat, even though it was honestly not his fault because he didn't realize at that time that talking rats exist at all. Ever since then, whenever he catches a rat, while he plays with it, he gives it a chance to talk. If it can talk, he'd let them get away.

Anyway, it might be somewhat unpleasant to be Fluttershy, who can talk to almost all animals (except maybe vampire fruitbats), living in a world where most ponies don't understand any animals' speech.