John Kokas was repeatedly punched in the face and upper body by the aggressive 6ft, 200lb three-year-old red male.
He had reared the animal, which had never attacked before, since it was six months old - but now faces having to put it down.
A woman called 911 at 10.50am saying her father-in-law had been attacked.
Breathlessly, she told the dispatcher who had asked what was going on: 'My father-in-law got hurt by an animal, bad.'
When asked what his injuries were, she replied: 'All over. I don't know how to explain it, but it's bad.'
The surprised dispatcher was then told it was a kangaroo that had caused the incident.
Experts believe Tuesday's attack, at the Kokas Exotics Animals Farm outside Green Camp, Marion County, Ohio, occurred because the beast was protecting a female on heat. Read More