Don't Let the Pigeon Drive the Bus! - Mo Willems
Boss Baby by Marla FrazeeHorton Hears a Who - Dr. Seuss
How the Grinch Stole Christmas - Dr. Seuss
The Lorax - Dr. Seuss
Marvin K. Mooney, Will You Please Go Now! - Dr. Seuss
Winnie the Pooh
Any of the Richard Scary Books
Well, I would say he would probably be happy with any of the Dr. Seuss Books that he doesn't already have.