Devil Dog: The Hound of Hell

Devil Dog is a Straight-to-TV horror movie from 1978. In the film, a dog that is a minion of Satan terrorizes a suburban family.

In other words, it's The Omen. . . with a dog

The film contains the following tropes:

 * Hell Hound
 * Recycled in Space: It's The Omen, with a dog.
 * Sequel Hook
 * Special Effects Failure: During the finale of the film, the title character transforms into a giant and terrifying demon. Well, it would be terrifying, if it didn't look fake and see-through throughout the entire scene.