RSPCA WA is investigating the death of about 25 cows in a paddock in Oakford.
A member of the public made the disturbing discovery earlier this week before alerting authorities.
According to 7News, the owner of the cattle is currently away, but their son said the livestock had contracted pneumonia.
The dead cows have reportedly been in the paddock for a number of days, but the son said due to the weather they have not been able to move them.
Locals urged to look out for man who removed electronic monitoring device
Detectives are looking for a man who removed his electronic monitoring device and could be in the Mandurah area.
WATCH: Whale beached at Long Point
A humpback whale has beached itself at Long Point in Port Kennedy.
City of Rockingham records steep increase in animal cruelty complaints related to untreated medical conditions
RSPCA WA has recorded a 70 per cent increase in animal cruelty reports relating to pets suffering with untreated medical conditions in the City of Rockingham.
Accused dirt bike hoons charged by Mandurah Police
Mandurah Police have caught up with two children accused of ripping up a Halls Head sporting oval on a dirt bike.
Heavy rainfall, thunderstorms to lash Mandurah down to Busselton
The Bureau of Meteorology has issued a storm advice for the South West of WA including Mandurah and Bunbury.
Drivers escape serious injury after West Pinjarra, Baldivis crashes
It's been a busy morning for emergency services responding to separate crashes in West Pinjarra and Baldivis.
Police investigate stabbing of two men at Warnbro home
Police are investigating the stabbing of two men inside a Warnbro home.
Shark sighted in Dawesville Channel
A great white shark has reportedly been spotted inside the Dawesville Channel.
City of Rockingham has highest number of households receiving rent relief
City of Rockingham residents claim the most rent relief in Western Australia.
