What Pet Should I Get? wasn't just a pile of notes that Dr. Seuss left behind when he died; it was actually found as a complete manuscript, pictures and all. (Source)

Some people think that What Pet Should I Get? might have been a jumping off point for One Fish Two Fish because it features the same sibling duo. (Source)

What Pet Should I Get? is only the beginning! There are at least two more previously unseen Dr. Seuss books. (Source)