Scrapie
The name scrapie is derived from one of the clinical signs of the condition, wherein affected animals will compulsively scrape off their fleeces against rocks, trees, or fences. The disease apparently causes an itching sensation in the animals. Other clinical signs include excessive lip smacking, altered gaits, and convulsive collapse.
Scrappy-Doo
Scrappy, from his very first appearance, has been shown to be quite courageous, charging attacking monsters with little worry to his own safety. He also did not take kindly to those insulting his Uncle Scooby or Shaggy. Later episodes showed he had an adventurous streak, and was oblivious to his two caretakers not sharing such a trait. He was almost always happy and rarely sad, fitting with the show's light-hearted tone. As time grew on, he became more reserved, and opted to help find clues instead of fighting, though he was still feisty and brave throughout his run.Mel Blanc was the first choice to voice Scrappy, given his connection to Henery Hawk, but wanted too much money to voice the part. The second consideration was actor Frank Welker, who coined the catchphrase "Puppy Power" during his audition. He would later change this to "Monkey Muscle" for the similar Donkey Kong Jr. character he would voice for TV's "Saturday Supercade". The next choice was Messick, who was seen as giving the best audition, but still deemed "the wrong voice". Afterwards, other well-known cartoon voice artists were considered or suggested: Daws Butler, Paul Winchell, Marilyn Schreffler, Howard Morris, Dick Beals and Marshall Efron. Ultimately, Lennie Weinrib was chosen, and after the first season, Messick became the final voice for the rest of the series' run after Weinrib asked for a higher salary.