Werewolves, for all their bloodlust and brute strength, are crafty creatures. Their howl can not only summon other werewolves, but also calls forth regular wolves. In some rare cases, the howl can even call bears into the fray. It is incredibly easy to be outnumbered by a lone werewolf.
The best advice this seasoned werewolf hunter can give you is this. Cut the beast's throat before it can howl and call others to its side.
Yours in love,