or four words. His catchphrase, usually howled at the end of every production, is "Scooby-Dooby-Doo!" or "Rooby-Rooby-Roo". Scooby was voiced by Don Messick through Arabian Nights in 1994, after which point Messick quit smoking; quitting smoking changed his voice and prevented him from achieving the same raspy vocal effect (despite Messick's efforts, he suffered a career-ending stroke in 1996 and died in 1997, before any further Scooby-Doo productions were made). Messick is also known for providing the voice of the dogs Astro on The Jetsons and Muttley (who snickered). The characteristic speech impediments of Scooby and Astro are so similar that Astro's signature phrase, "Ruh-roh!", is popularly and improperly attributed to Scooby (as in "Ruh-roh, Raggy!"); of the two voices, Scooby's had a deeper and throatier timbre than Astro's. According to Fred in Scooby-Doo: Behind the Scenes, the thought having a dog with an Adam's apple was a little strange, but they got used to it, so when he started talking, it wasn't a big deal. But despite his special gift of speech, he did have his shortcomings like his cowardice. But as Mystery Inc. bonded, he would form a special partnership with Shaggy, comparing themselves to Sherlock Holmes and Dr. Watson. Shaggy says that things just clicked and whenever the gang needs bait for a villain, they would send Shaggy and Scooby in and he says there's no one else he would rather work with. Fred claims that the only thing that scares Scooby more than monsters is a trip to the vet. Appearance and anatomy Scooby is brown from head to toe with several distinctive black spots on his upper body and does not seem to have a melanistic mask. He is generally a quadruped but displays bipedal 'human' characteristics occasionally. Scooby also has opposable thumbs and can use his front paws like hands. He has a black nose and wears an off-yellow, diamond-shaped-tagged blue collar with an "SD" (his initials) and has four toes on each foot. Unlike other dogs, Scooby only has one pad on each of his paws (so that it was easier to draw in the Scooby-Doo Annuals). Scooby has a fully prehensile tail he can use to swing from or press buttons. Both his head and tail are malleable and useful as a communication aid or creating a distraction. Creator Iwao Takamoto later explained that before he designed the character, he first spoke