Bad Dog is a character in the film Top Cat Begins. He is voiced by Diedrich Bader.
About Bad Dog
He has bright red hair and he always wears a blue jacket. He threatened the orphans that he would burn down the orphanage if they don't steal for him.
He is also very loyal to Mr. Big. When Spook is telling his story about Eleanor, we can see Bad Dog in the background which means that he has been with Mr. Big for a long time.
The feature film: