The Bad Guys (Book 1) by Aaron Blabey
They sound like bad guys, they look like bad guys . . . and they even smell like bad guys. But Mr. Wolf, Mr. Piranha, Mr. Snake, and Mr. Shark are about to change all of that...Mr. Wolf has a daring plan for the Bad Guys' first good mission. They are going to break two hundred dogs out of the Maximum Security City Dog Pound. Will Operation Dog Pound go smoothly? Will the Bad Guys become the Good Guys? And will Mr. Snake please stop swallowing Mr. Piranha?!