Cat Ninja: Dog Days

by Marcie Colleen, Stephanie Cooke, Matthew Cody

In volume 7 of the hugely popular Cat Ninja series, our hero races to save man's (and cat's!) best robotic friend, Adonis, from the villainous creator who never wanted him to be a Good Boy.

When Adonis's super-strength zoomies leave a dog-shaped hole in the wall, he hears the two worst words he Bad dog! Worried that his villainous origins mean he can never be truly good, Adonis turns to his creator, Doctor Von Malice—who offers a double-cross disguised as a fresh start.

Now Cat Ninja, Fleabot, and a factory-reset Adonis must face mutant guinea pigs, a villainous vet, and an explosive old foe to restore Adonis to his lovable, slobbery self.
Volume 7 of the bestselling Cat Ninja seriesRead more than 300 million times on EpicAward-winning, full-color stories for all agesThemes of loyalty, bravery, and found family
Suit up with Cat Ninja and save the day!

160 pages, Paperback

Published September 29, 2026

About the author

Marcie Colleen is the author of numerous books for children, among them Love, Triangle; Penguinaut!; The Bear's Garden; and the Super Happy Party Bears chapter book series. Forever a New Yorker, she now lives in San Diego, California.