While dropping off some garbage at the island junkyard, Jerry's dog chases after a rabbit into the trees, but is attacked by an unknown creature and is injured.

As the rest of the pack surround the car and try to break in, Jerry arrives and drives the dogs off, killing a Labrador Retriever with his shotgun.

During their walk through the forest, Tommy hears the pack of dogs howling nearby and starts running for his life.

Lois chases after Tommy, but quickly loses him and is forced to seek refuge in an abandoned barn where the dogs sleep.

Tommy runs through the forest, the pack in close pursuit, but soon trapped at the edge of a cliff towering above the ocean.

Meanwhile, Jerry and Hardiman manage to warn Walker, Dodge and Marge about the dogs roaming the island and bring them back to the house.

After searching the side of the cabin, he finds inside what's left of the old man's lifeless body, having already been mauled and devoured by the pack.

Realizing that the dogs will return for another assault, Jerry tells his family, Marge, Hardiman and Walker to board up the windows and doors of the house.

Later that night, the group carries Dodge's body down to the docks and place him in a boat, pushing it out to sea to prevent the pack from trying to get to it.

He grabs Jerry's shotgun and runs down to the docks to find a small group of people in a motorboat several yards out at sea.

Meanwhile, Jerry, having heard the sound of the shotgun being fired and realizing that Walker has headed down to the docks, takes his Jeep and drives down there, only to find him surrounded by the pack.

The moving Jeep runs over the majority of the pack, killing a gray terrier mongrel and forcing the rest of the dogs to retreat into the forest.

Tired of waiting for help, Jerry orders Millie to take Marge, Riley, Walker and their sons out to the docks, while he and Hardiman will try to finish off the pack.

As soon as the dogs are all inside, Hardiman closes the door behind them, pours several bucketloads of gasoline on the walls and sets the house on fire with a torch.

Jerry holds him off for a short while, but as the flames reach the floor of the attic, he pushes the dog back and jumps through a window, sliding off the roof and landing on the grass below.

Millie and the others return to the house and watch as the burning building explodes and collapses, killing all of the dogs inside.

The film ends as the dog starts licking Jerry's hand, apparently winning the trust of the man and becoming a pet again.