This book was written by James Howe and illustrated by Amy Walrod.
It was published by Atheneum Books for Young Readers, an imprint of Simon & Shuster Children's Publishing Division.
"A girl mouse must do what a girl mouse must do."
In this charming tale of three best friends, Horace, Morris, and Dolores, Dolores must decide what to do when the Horace and Morris join a boys-only club. Naturally, she joins a girls-only club. The three soon begin to miss their days of friendship and adventure, and ultimately start a new club in which everyone is welcome.
This is a great story of friendship, overcoming obstacles, and equality!
There are some lesson plans available online to accompany this book.