Laddie

Laddie is a famous fictional rescue dog.

Season one
The gang wanted to lure out the Phantom to be caught in a trap, and wanted to use Scooby-Doo (disguised as a human) as bait. They got Scooby dressed up, but he refused to go any further, so Fred Jones tried and failed to get Scooby brave by telling him to be like Laddie.

Shaggy Rogers called Scooby, Laddie, after he saved Candy Mint from the Ape Man when it shook the bridge she was on.

Notes/trivia

 * Laddie is a Collie and the eponymous star of Son of Lassie, a 1945 feature film set during World War II. When Lassie's fully grown son, Laddie, stows away in his master's bomber, and then has to get him to safety after they crash over enemy lines. Both Lassie and the adult Laddie were played by Pal (with the on-screen name of Lassie).