Seamus O Domhnaill, aged 83, died from multiple injuries, including a fractured pelvis and collapsed lung.
He was found injured near the cattle. Numerous hoof prints were discovered on his clothing and body.
Mr O Domhnaill had been out walking his dog near his home in Milford Close, Milford Road, Castletroy, on September 9 last when he was found badly injured.
Elizabeth Fennessy said she visited her mother at Milford Hospice that afternoon at around 3pm and saw Mr O Domhnaill, whom she knew, walking his dog.
About 50 minutes later she went to a local bank in the Castletroy Park Hotel. On coming out of the bank she noticed Mr O Domhnaill’s dog.
The dog was on its own and Ms Fennessy sensed something was wrong. She drove around for about 10 minutes. At the entrance to the water treatment plant at Plassey she saw cattle and Mr O Domhnaill lying on the ground.
She used a phone borrowed from two passing Polish teenagers to ring the emergency services. When she went to help Mr O Domhnaill he kept repeating to her to keep the cattle away from him. He did not say how he sustained his injuries.
Pathologist Dr Elizabeth Mulcahy said death was due to multiple traumatic injuries.
A spokeswoman for the family thanked the emergency services for the assistance they had given the late Mr O Domhnaill and she said the family were grateful to the coroner for holding the inquest so promptly.