The accident happened on Saturday as Rolf Rudsengen tried to chase away two cows that had stepped onto his land near Trevatna Lake, newspaper Nationen reports.
One of the cows responded by attacking Rudsengen, breaking three of his ribs and a shoulder blade in the process. The animal is believed to have bundled the man to the ground before dragging him several metres across a field.
There were no eye-witnesses to the incident, but a neighbouring woman heard his cry for help and called for an ambulance.
When she arrived at the scene, she too was attacked by the cow.
Rudsengen died from his injuries on Tuesday at GjøvikHospital.
Its owner has now had the animal put down.