Survivors (Erin Hunter). Original series

"Lucky and the rest of the Leashed Dogs have settled in the forest--but a vicious Pack has claimed the land, and will stop at nothing to ensure that it is theirs alone"--

"Lucky and the rest of his Pack encounter another group of dogs that has survived the Big Growl--and these new dogs may be their most dangerous enemies yet"--

With Sweet as their new Alpha, the dogs of the Wild Pack hope they will finally find peace, but Lucky is still troubled by visions of a terrifying future that will force every dog to fight tooth and claw for survival.