Shaggy ranks at #647 with 189 entries, registered male. The name is a coat-description-as-name pet pick with a strong Scooby-Doo overlay, and on a registry it lands almost exclusively on dogs whose actual coat is, in fact, shaggy. The naming is direct visual reference dressed in pop-culture wrapping.
The visual-coat-naming logic
A large share of registry Shaggys are dogs with long, unruly, or shaggy coats: Old English Sheepdogs, Havanese, sheepadoodles, Bouvier des Flandres, Bearded Collies, and shelter mixes with thick wavy coats. The naming is direct visual reference, and the breed concentration is strong because the name only lands cleanly on dogs whose coat actually carries the description.
The Scooby-Doo overlay
The cultural anchor most owners share is Shaggy Rogers, the human teenage character in the Scooby-Doo franchise (1969 onward). The character's combination of laid-back register and constant snack-seeking reads cleanly onto a hungry, easygoing dog. Many registry Shaggys come from households where the cartoon's reruns or revivals were part of the daily TV diet during the owner's childhood.
Sound and the broader cohort
Two syllables, front-stressed (SHAG-ee), with a soft sibilant opening and clean recall. The shape works in noisy environments. Shaggy sits with Scruffy, Fluffy, and Wooly in the descriptive-coat pet pocket, where the name describes the dog rather than reaching for a separate cultural reference. The human Shaggy page shows essentially no SSA presence; pet Shaggy owns the cultural space without competition.