Angel in Spikes - The Werewolf War

Book III in the Angel in Spikes series.
During one of their forays into a deep ravine the three newly formed werewolf packs run into five females in terrible physical shape and take them home to nurse back to health. The women tell them that they had been hiding in the woods after escaping captivity by malevolent werewolves who had been breeding them to increase their numbers in order to kill all competing groups.
Angela and her friends all concur with the femals' idea for the need to kill all these werewolves first or be killed themselves, and formulate a plan to do so.