Einstein is a character in the Dean Koontz novel Watchers. He is featured in the film adaptation and the sequels.
Einstein is a golden retriever with genetically enhanced intelligence. The dog is trained to infiltrate behind enemy lines during war. Then the other genetically enhanced monster OXCOM is released to come find him, killing all the enemies in the way.
Einstein escapes from his lab and is taken in by Travis Cornell. When OXCOM also escapes, it kills everyone it comes into contact with trying to track down Einstein.