My Favorite Pets by Jeanne Birdsall illustrated by Harry Bliss

Gus must write an essay about his favorite pet for his teacher Ms. Smolinski.  The text is situated on lined school paper and the font looks handwritten.  The reader learns about Gus' humorous escapades with the family's seventeen sheep.
Gus is a bit sneaky and naughty and not very nice to his little brother.
-Borrowed from the library.