Wolf is Grady Tucker's dog, he appeared in the fourteenth Goosebumps book, The Werewolf of Fever Swamp.


The dog runs into the house, pounces on Grady, and licks his face. Grady becomes attached to the dog and decides to keep him. He names him Wolf because he looks like a wolf. Over the nights, there are animal killings, and Emily and Grady's parents all accuse Wolf of being the killer. Grady's dad even tried to get rid of him, but Wolf ran into the forest just in time. Grady's friend, Cassie says it was a Werewolf, and she happens to be right. Grady assumes it's The Swamp Hermit, but, it was actually his friend, Will Blake. He bites Grady, but then Wolf comes to the rescue and defeats Will. Grady becomes the new Werewolf, and every night, he hunts with Wolf.


He has the appearance of a wolf, grey fur, a black nose, and long hair.