― Like an amazing amount of TV-based dogs, Brain wasn't your average kind of dog. Like Lassie, Scooby-Doo and even Family Guy's Brian, Brain was a lot more intelligent than you might initially think. I'm not really sure who's dog he was, whether he was Gadget's or Penny's. But, one thing I do know, is that he was the other half of the crime-solving double act that was him and Penny. ∙ Interestingly, Brain was voiced by the same person as Dr. Claw, and that person was probably one of the [...].