Do all of Dr books rhyme?

You're likely thinking of the children's book series "Dr. Seuss," written by Theodor Seuss Geisel. Yes, all of Dr. Seuss's books rhyme.

He was famous for his playful use of language, whimsical stories, and catchy rhymes.

However, not all children's books rhyme, and there are many other authors who write for children.