Where the film falls down is in fact in the original concept as laid down by Dean R. Koontz. Koontz has a bad tendency to write books that are constructed for their effect rather than their credibility. The concept of the dog and the Oxcom monster is an improbable deus ex machina that has been set up solely to contrast a heart-tugging boy-and-his-dog piece against the idea of a vicious monster coming closer. However, in terms of credibility, the Oxcom falls well of short of the ultimate killing machine it is called two to three people a day is hardly efficient slaughter in military terms. The scenes of the dog demonstrating its intelligence start out well but by the time we get to a dog typing with a pencil in its mouth and using Scrabble letters and a dictionary, the concept descends into the laughably preposterous. Corey Haim gives an annoyingly geeky performance playing to the dog.
Roger Cormans Concorde Productions produced three sequels, which use the same basic idea. These are Watchers II (1990), Watchers III (1994) and Watchers Reborn (1998).
Other Dean R. Koontz adaptations are: Demon Seed (1977), The Face of Fear (1990), Whispers (1990), Servants of Twilight (1991), Hideaway (1995), Phantoms (1998), Intensity (tv mini-series, 1997), Mr. Murder (tv mini-series, 1998), Sole Survivor (tv mini-series, 2000), Black River (tv movie, 2001), Frankenstein (tv mini-series, 2004) and Odd Thomas (2013). Director Jon Hess later went onto genre films such as Alligator II: The Mutation (1991), Mars (1996) and Legion (1997).
Full film available online here:-