The Gate (1987)

The boy Glen and his best fried Terry accidentally open a gate to hell when a rotten tree is removed from the backyard of Glen's house. When his dog die and a friend of Glen's sister, the teenager Alexandra, buries the animal in the hole, demons from an ancient civilization are released, seeking for two human sacrifices to dominate the world. Glen, Al and Terry, who are spending the weekend alone in the house, fight to save their lives and close the hole.