Many years ago people were sometimes bitten by a rabid wolf. Rabies is a terrible disease,now practically wiped out. But a human infected by rabies will develop the disease of Hydrophobia; a dread of water! Many died many years ago, rabies was nearly always fatal. Even now it is very difficult to cure.
One of the most fearful effect of rabies is that the victim becomes really "savage"; ferocious! And will bite anyone that comes near. That is where the belief in Werewolves comes from. Rabies! The victim seems to turn into a wild animal! A wolf! And if the victim has a lot of body hair, it looks even more "Wolf-like"!
But the Werewolves of Hollywood? Not only are they unreal; they are ridiculous! Even real wolves don't howl at the moon! They howl at each other!