Angel in Spikes - The Werewolf War
by Aaron Pery
Book III in the Angel in Spikes Series.
In one of their weekly forays into a deep ravine the three werewolf packs run into five females in a terrible physical shape, who they take home and nurse back to health.
They were hiding in the woods after escaping captivity by malevolent werewolves who had been breeding with them forcefully to increase their numbers and kill all other competing groups.