Harrison is the primary antagonist and culprit in the book, Howliday Inn, part of the "Bunnicula" series.
When the Monroe family decides to leave for a vacation, they send Harold and Chester off to a kennel called Chateau Bow-Wow (A special boarding house for special cats and dogs). There, they meet the other inhabitants of the kennel: A frustrated poodle named Louise, an athletic bulldog, a mutt named Taxi, a crazy cat named Lyle, a flirtatious poodle named Georgette, and two dachshunds named Heather and Howard, who Chester is certain are werewolves. The owner of the kennel, Dr. Greenbriar, is taking the week off and the other staff, an aspiring vet named Jill and a comic-book reader named Harrison who hopes to make a million bucks before he is twenty-one, are overworked. Because they are overworked, they make a lot of mistakes, especially Jill. These mistakes include feeding the animals late and temporarily misplacing Chester's file. Harrison will later use this tendency to forget things to his advantage. Tensions are high between the two as a result of stress. In the midst of adapting to their temporary new lives, a mystery soon unfolds when Louise goes missing. Although the kennel workers decide she ran away, Chester becomes certain that foul play was involved. Just when he seems to have solved the mystery, Chester too vanishes. When investigating, Harold overhears Harrison, one of the kennel workers, reporting that he tested Chester's cat food and that it was laced with poison. Horrified, Harold attempts to continue Chester's work and solve the mystery. One evening, Harold finds the message "Help Howls out now!" scratched into his dog dish. Chester mysteriously returns later, then rounds up Harold, Taxi, and Lyle. He leads them to find Harrison attempting to capture Heather and Howard. The animals raise the alarm and Harrison is caught by the other kennel workers. Chester tells Harold later that Harrison caught wind that one of the animals in the shelter was very valuable. He first kidnapped Louise and then Chester thinking that it could have been them, but found out that it was the dachshunds, who were actually rare wire-haired dachshunds. He also learned that Heather was going to have puppies, making him even more determined to capture them all to get rich. When Dr. Greenbriar and Jill hear the dogs barking and find, first Lousie at Harrison's house with Max and Georgette, who snuck out to find her, barking outside and then Harrison trying to capture the dachshunds with the other animals attacking him, he is tried and sentenced. The sentence is to go to university and pay for it by working at the zoo. When the Monroe family arrives after their vacation, they reveal that they're also adopting the runt of the dachshund litter, which they name Howie—Pete named him this because the puppy's father's name was Howard.