A boy takes in a stray dog, later finding out that it's an ultra-intelligent runaway from a genetic research lab. Unbeknownst to him, the dog is being stalked by another escaped creature that's not quite so friendly.
Watchers is a 1988 science fiction horror film directed by Jon Hess and starring Corey Haim, Michael Ironside, Barbara Williams, and Lala Sloatman. It is loosely based on the 1987 novel Watchers by Dean R. Koontz.