Upchuck and the Rotten Willy (Upchuck and the Rotten Willy #1) by Bill Wallace, David Slonim (Illustrator)

Chuck’s a cat with a great life—until Katie goes away to college and his best friend moves. Left all alone, Chuck starts to venture farther and farther into the neighborhood and one fateful night finds himself face-to-face with a beast as big and black as death. His name is Rotten Willy—and he’s a dog with a heart of gold.