Yuck is ugly and blue and doesn't really look anything like a dog. When the Grungy family moves into the Firehouse, Yuck takes up residence in one of the Ghostbusters' storage lockers. However, he is no match for Slimer.
Yuck is quite ferocious, but oddly is afraid of his own reflection.
- Even though he lacks resemblance, he is likely a parody of Santa's Little Helper, the dog owned by The Simpsons.
- Also, his name is a parody of Buck, the dog from the hit TV show "Married with Children".