Holub, Joan. School for magical monsters #3

Aladdin Quix

"Cerberus is a three-headed Beast with a scary-dragon tail. Each head has its own name and special sense. But all three share a big secret: they are afraid of EVERYTHING. They are even afraid to test out their bark! At their school, more Creatures than Beasts have earned their specials powers, and Cerberus wants to help their team even the score. When they are triple-dog-dared by the mysterious Sphinx to teach her how to bark, Cerberus is worried she will find out their embarrassing secret. And when their counter-dare to Sphinx goes a little awry, Cerberus learns that they might have more courage than they ever imagined." --

Ages 5 to 8