How literate were the animals in Animal Farm?

The pigs were, for the most part, literate.

The goat was literate, but reluctant to read anything for the other animals.

The workhorse only knew the first few letters of the alphabet.

The other animals were able to read at about a kindergarten level, but could not read t he complex commandments written on the barn, nor the writing on the side of the van that cam to take the workhorse away