He has brown fur, and looks somewhat old. In Channel Chasers, his fur was colored white. He likes to sleep, but he is very mischievous. You'll see him on Channel Chasers, the episode where Timmy and Vicky go into the T.V. World. They go from various channels.
In the TV movie, Channel Chasers, after Vicky and Timmy's actions had resulted in the Turner's house being destroyed while Mr. Turner's boss was paying a visit to award him the "Cleanest house award" plaque. When he saw what had become of the Turner's house, Timmy's Dad's boss tossed the plaque and the money bonus along with it to Dinkleberg nearby, who decided to play fetch with Mr. Turner's plaque with Dinkledog, who was yapping nearby. He was colored white in this brief appearance.
In the episode, Operation: Dinkleberg, Mr. Turner becomes suspicious of Mr. Dinkleberg being evil, and sneaks into his neighbors' house. While trying to sneak by Sheldon, who was sleeping on the living room couch, he trips over Dinkledog who was resting on the floor. He then yelps and runs away. In this appearance, his fur was colored brown.