The NSW opposition is calling on National Party MPs to vote against the government's statewide greyhound racing ban in the midst of a NSW Supreme Court challenge by racing clubs.

A greyhound racing industry alliance including clubs from across the state has mounted a legal challenge against the ban, which was based on the Report of the Special Commission of Inquiry into the Greyhound Racing Industry.

The industry alliance's legal team says it has filed proceedings in court seeking to declare the government's racing inquiry report invalid.

Brenton Scott, chief executive of the NSW Breeders, Owners and Trainers' Association, claims the report is littered with errors.

"The idea that a government can ban a perfectly lawful racing industry ... on the basis that it has lost some form of 'intangible and unwritten' social licence would be a very worrying development to many in the community," he said.

However, acting premier and Minister for Racing Troy Grant has hit back, saying the challenge is a waste of money.

"The greyhound industry should have invested as much time and resources into ridding itself of live baiting and animal cruelty as it is now spending on lawyers, lobbyists and spin doctors," he told AAP yesterday afternoon.

Meanwhile, NSW Labor has called on National Party MPs to vote against the bill when parliament resumes on Monday.

"Abstaining from the vote isn't enough, National MPs have to stand up and be counted," Shadow Minister for Primary Industries Mick Veitch said.

The court challenge comes amid allegations of numerous mass greyhound graves in NSW, weeks after a site was discovered in the Hunter Valley containing at least 99 dead dogs.