Rat Man

My uncle Larry worked at this military lab where they were doing genetic experiments trying to cross rat genes with humans and they accidentally made a half man, half rat creature. It's about 4 feet tall, weighs 80 pounds, and alternates between running on two legs or bounding on all 4. It's jaw muscles were so strong it chewed it's way out of a steel cage. The guards put 3 bullets into it but it escaped anyway into the sewers and it's been living down there ever since, preying upon stray dogs and cats. I didn't believe the story until I walked over a storm drain, looked down, and saw something huge in there with a pink tail like a garden hose.