The three-year old golden retriever/poodle mix escaped from his invisible fence in Fulton, Maryland, joined the race around five miles in and crossed the finish line at the 2 hour, 14 minute mark.
According to ESPN's Thomas Neumann, "Maryland Half Marathon co-founder Jon Sevel said many runners spotted Dozer in various places on the course, at times lapping up water from cups at rest areas, but nobody realized the dog was running solo."
Asked whether Dozer would be paving the way (get it?) for the Maryland Half Marathon to open up to non-humans, Sevel said "At the very least, Dozer will have his own bib number -- K9. "We will definitely have him involved."
Even more amazing than finishing the race was Dozer politely excusing himself and running back home to his owners as if nothing had happened.
Though he ran eight miles alongside 2,000 or so other half-marathoners, Dozer was fine the next day. And once his owners and the race organizers realized what had happened, he even earned a medal for his efforts.