DEVIL DOG: THE HOUND OF HELL

The Barry family acquired a German Shepherd puppy after their old one died in an accident. They get the puppy from a seemingly friendly fruit vendor who is a Satanist who bred the dog during an evil ceremony, causing it to be possessed. The Satanic cult then gives away the dog's offspring to wreak havoc in the world in the hope that Satan will overcome good once and for all. The Barry family names the dog Lucky.

Lucky acts very strangely when they bring him home, leading the father, Mike, and the family maid to believe that there is something wrong with him. Mike starts to believe so after the maid is killed in a fire while she was watching Lucky, and he is nearly forced to stick his arm into a lawnmower while it is running while Lucky is present. Mike barely avoids having his arm cut off and soon, Lucky begins to exhibit mind control powers that allow it to kill, injure, or mentally control many victims. Eventually, the family's souls are possessed by Lucky, causing them to act strangely, including Mike's son framing another student by stealing a watch and planting it in a classmate's locker, thus allowing him to win the student election.

Mike finally decides that Lucky has overstayed his welcome when he finds a secret shrine to Satan in the attic. Mike tries to shoot the demonic beast to put an end to the hardships, but he is unharmed. Realizing that the dog is possessed, Mike finally makes a special trip to Ecuador to determine how to destroy the animal. Unfortunately, there is no way to kill it, but if you hold a holy symbol to its eye, you can imprison it in Hell for 1,000 years. He takes Lucky to a showdown at his work plant, but there Lucky turns into a demonic version of himself and begins to pursue Mike. When Mike is cornered by Lucky, he holds the sign he made in his hand right up to the beast's eye. This causes Lucky to be engulfed in fire and imprisoned, getting his family's souls back.

The final scene shows the family loading the family car for a vacation and Mike's son mentioning that there were 10 puppies that the vendor was selling and wondering where the other nine are, suggesting that there are more Satanic dogs out there somewhere and that it is not over yet.

Mike uses a holy symbol to imprison Lucky in Hell for 1,000 years, freeing his family's souls. The film ends with the implication that there are more possessed puppies still in the world.

The ending provides catharsis as the family is freed from Lucky’s supernatural grip, thanks to Mike’s discovery of how to contain the evil. But the final hint that other dogs from the same Satanic litter are still at large leaves the evil unresolved, suggesting that the threat of devil dogs may never truly be over. It’s a classic horror move: resolve one crisis, only to crack open the door for more.