Officers were patrolling the Pilliga West National Park at 10.15pm on Friday when they spotted a grey Toyota Hilux driving at low speed.

"Two dogs were allegedly seen running along in front of the Hilux," state rural crime co-ordinator Detective Inspector Cameron Whiteside said.

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Police stopped the vehicle and observed a medium sized dead pig (sow) in the rear of the utility.

The dogs were scanned and one was found not to be microchipped, with neither dog having a name tag on their collars - in breach of the rules.

The man was issued a $500 fine for hunt/shoot/injure/capture etc or possess animal in park. Official warnings were recorded for other offences including dog not wear collar/name tag and not identify companion animal as prescribed.

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"There is no excuse for hunting in a national park, particularly when there are half a dozen state forests within an hour's drive which allow night time hunting with dogs," North-West Rural Crime Zone Co-ordinator, Detective Sergeant Bennett Nolan said.

"Anyone who is caught illegally hunting will be on our radar and may face confiscation of vehicles and equipment."

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Detective Sergeant Nolan also warned hunters that their pig dogs must been correctly identified in accordance with NSW laws.

"All hunting dogs must be microchipped, registered, and wear a name tag in public," he said.