The man's family called police, saying the 55-year-old was acting oddly.
Heavy smoke could be seen from several miles away.
The 18-year-old had just left a restaurant with his family.
More counties are considering similar gun protection resolutions.
The horse was found frozen and dead from a gunshot wound.
Members of the public have been urged not to approach Ryan Petro,
Police say they've had reports of a second video showing the animal's mistreatment.