Yabba-Doo is a white Great Dane. He looks like his brother Scooby, but white instead of brown and his fur is visibly more unkempt than his mystery solving brother. He doesn't wear a collar, instead he wears a red bandana around his neck and a brown cowboy hat. In the Laff-A-Lympics he also wears an blue team shirt with a "S" on it.
Yabba is a stark contrast to Scooby. He is brave at any given time, not only when it is necessary. He will do anything to protect Tumbleweed county, including cross dressing. He also pronounces his words clearly, albeit with an accent.