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The Scooby-Dee impostor is a white dog belonging to Jim Moss.
He was masked to look like Scooby-Dee, but under the mask was a scruffy-looking face.
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The Scooby-Doo Show
The imposter first appeared when Scooby-Dee was traveling on a train with the gang. Dee left her berth to get a drink of water, and the Ghost of Milo Booth grabbed her, muzzled her, and put her into a sack. The impostor took her place so that the gang didn't know she was dog-napped. The impostor gave himself away when Scooby-Doo and Scooby-Dum wanted a kiss. He was unwilling to kiss them, so he pulled back their lips and sprinkled them with water instead. This caused them to get suspicious since the kisses didn't feel right.
In the end the impostor was unmasked, and the plot was revealed: he was going to make money for his master, Jim Moss, by making new Scooby-Dee movies in her place.
- The impostor dog could speak perfect English and even imitate Scooby-Dee's voice and southern accent.