What snack do Shaggy and Scooby love?

Shaggy and Scooby love Scooby Snacks.

Scooby Snacks are the fictional treats repeatedly used to tempt Scooby-Doo and Shaggy Rogers into facing danger, investigating suspicious places, or cooperating with the rest of Mystery Inc. They are usually depicted as biscuit-like snacks, often shaped like dog biscuits or bones, although different versions of the franchise sometimes change their appearance.

The joke works because both characters have famously enormous appetites. Scooby is a talking Great Dane with a fearful but food-motivated personality, while Shaggy is his lifelong human companion and an enthusiastic eater. Their willingness to accept a Scooby Snack often overcomes their reluctance to chase supposedly supernatural villains.

A common mix-up is answering “hot dogs,” since hot dogs are among Shaggy and Scooby's favorite foods and feature heavily in the series' food jokes. However, the named snack associated specifically with persuading them is Scooby Snacks. The treats are fictional within the cartoons, but licensed real-world dog treats and human snack products have also used the name. In some continuities, Shaggy eats them too, blurring the line between dog biscuit and cookie.