When a New Orleans bartender picks up a cell phone dropped in a brawl, he begins to receive ominous messages -- and finds his sanity slowly unraveling.

A large meteor crashes into a quiet town, and pet dogs become mysteriously aggressive. attacking and killing the residents. Teenager Roslyn (Mays) and her old but faithful dog Shep are out camping when the attacks hit. Now separated by the chaos in town and blocked roads, Roslyn and the other members of her family must find each other by fighting back against the blood-thirsty hounds before the dogs take over the whole town and escape becomes impossible.