"Grogan's narrative" likely refers to John Grogan's book "Marley & Me," which is a memoir about his family's experiences with their mischievous and energetic dog, Marley. Here are two examples of incidents from the book where Marley's behavior is described as "highly strung and out of control" and adds humor to the story:
Marley's fear of thunderstorms: In the book, Grogan describes how Marley is terrified of thunderstorms and reacts by destroying everything in sight. During one particularly bad storm, Marley destroys a metal kennel and escapes into the night. The family spends hours searching for him in the pouring rain, only to find him cowering in a neighbor's garage. Grogan writes about how Marley's panic is both frustrating and hilarious, as the family tries to keep him calm while also trying to salvage their belongings.
Marley's encounter with a cat: In another scene from the book, Marley chases a cat up a tree and gets his leash tangled around the trunk. Grogan writes about how Marley's excitement turns to confusion and frustration as he tries to figure out how to get back down. Meanwhile, the cat perches on a branch above him, watching the whole thing play out. Grogan's humorous narration of the scene makes Marley's behavior endearing rather than frustrating, as readers can relate to the chaos and confusion of owning a hyperactive dog.