What is what breed is scooby doo?

Scooby-Doo's breed is never explicitly stated in the show, and is intentionally left ambiguous to allow for creative license in his design. However, he's generally considered a Great Dane. His large size, droopy jowls, and overall build strongly suggest this breed. While he has some characteristics that don't perfectly align with the breed standard (like his unusually short legs relative to his body), the Great Dane remains the most widely accepted assumption.