HANOVER, N.H. — Move over mockingbirds and watchmen. There's a new Yent in a tent in town.

Dr. Seuss' new book, “What Pet Should I Get?” features the same siblings seen in his 1960 classic “One Fish Two Fish Red Fish Blue Fish.” The book went on sale Tuesday, two weeks after the release of Harper Lee's long-awaited second novel, “Go Set a Watchman.”

But unlike some fans of Lee's 1960 book, “To Kill a Mockingbird,” those who love Dr. Seuss are unlikely to be disappointed, says Donald Pease, author of two books about Seuss and an English professor at the author's alma mater, Dartmouth College.

“It's a classic Dr. Seuss treatment,” he said. “What it does is it brings a child, actually a brother and sister, into relationship by way of a problem almost every child addresses in her or his life: What pet should I get?”

As the siblings ponder which animal to acquire — Dog? Cat? Fish? — they start to imagine more fanciful creatures: the aforementioned Yent, or a “thing on a string.” All the while, they face the constraints of what their parents would allow. The final illustration, which shows two eyes poking out of a basket, leaves readers guessing about their choice.

Pease suggests Seuss didn't publish the book because he used it as a jumping-off point for “One Fish Two Fish” instead.

“In a sense, the pet shop is giving the children access to the difference between the world of pets they can encounter in a pet shop, and the world of creatures they can only enter encounter by opening the book equivalent of a pet shop: the archive of Dr. Seuss's children's books,” he said.

For example, in “One Fish Two Fish,” the children have a Gox, a Gack, and a Wump with one hump.

Seuss grew up in Massachusetts, but it was at Dartmouth he found his passion for writing and drawing.

“I began to get it through my skull that words and pictures were Yin and Yang. I began thinking that words and pictures, married, might possibly produce a progeny more interesting than either parent,” he told an alumni magazine in 1975. “It took me almost a quarter of a century to find the proper way to get my words and pictures married. At Dartmouth I couldn't even get them engaged.”