M'Lady Moonbeam is the pet dog of Meadow, who hoped she would be the future grand champion. Meadow would let nothing get in her way, including the Secret Six.
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She is very loving toward Meadow, but fierce toward others. She ripped off a pants leg from Fred Jones, while wearing a Scooby-Doo disguise that made her look bigger. When the plan had been uncovered, she still tried to scare an impatient Scooby after she was unmasked, but he only barked back, scaring her off.