Bookstores across the country threw parties to celebrate the release of the latest, never-before-seen Dr. Seuss picture book, What Pet Should I Get?

An audience at Book Passage in Corte Madera, Calif., listens to a dramatic reading of classic Dr. Seuss stories.

A Book Passage display included a cake decorated with illustrations from the book’s cover.

Book Passage partygoers get their picture taken with the Cat in the Hat.

BookTowne in Manasquan, N.J., celebrated the release with a storytime.

Small Seuss fans enjoy treats at BookTowne’s release party.

Author R.J. Palacio and the Cat in the Hat helped celebrate the release of the book on July 31 in NYC at Barnes & Noble in Union Square. Palacio read from Horton Hears a Who and What Pet Should I Get?

Author Chris Grabenstein and the Cat in the Hat celebrated the book’s release at Barnes & Noble on Manhattan’s Upper West Side.

Booksellers eagerly share copies of the new picture book at Lemuria Bookstore in Jackson, Miss.

The excitement for the new title made it out onto the streets at Old Firehouse Books in Fort Collins, Colo.

Phinney Books in Seattle offered a full display of Seuss titles to celebrate the book’s release.

Booksellers at The King’s English Bookshop in Salt Lake City, don costumes and smiles around their What Pet Should I Get? display.