Every kindergartner knows that a sheep says baa, a cow says moo, a cat says meow and a goat says maa. But this is just in English. In other languages, they say other things.
When did animal sounds get their canonical English form? Did it happen before the Great Vowel Shift? Did cows "originally" say /moː/, or /muː/? What about consonants? Basically, what accent should my animal sounds be in?