In the book "Marley: A Dog Like No Other," the author John Grogan discusses the vocal tendencies of different dog breeds, specifically noting that Labrador Retrievers are not known for howling. Instead, howling is typical of Beagles and Wolves. Despite this, Marley, the Labrador, makes an attempt to howl in response to a police siren, albeit in a uniquely unconvincing manner. His efforts are more comedic than impressive, resembling a gargling sound rather than a true howl.

This moment highlights Marley's character and his humorous attempts to fit in with the natural behaviors of other breeds. Grogan's observation of Marley not only showcases the dog's distinct personality but also adds a light-hearted tone to the narrative, demonstrating how dogs, regardless of their breed, can surprise us with their quirks.