Australia's largest greyhound owner-breeder has been charged as part of an ongoing inquiry into unauthorised dog exports to China and Macau.

Paul Wheeler is one for four men charged by Greyhound Racing New South Wales for allegedly exporting nine greyhounds to China without the mandatory greyhound passport and certified pedigree.

In a statement, Greyhound Racing NSW said Mr Wheeler and three other industry participants, Danny Li, Wei Shan and Yiwen Xi were also charged with conduct detrimental or prejudicial to the interests and welfare of greyhound racing.

It is alleged the four also failed to attend or provide documents to the inquiry.

It is not clear when the dogs are alleged to have been exported.

Mr Wheeler declined to comment when the ABC contacted him at his greyhound complex at Boorowa, about 110 kilometres north-west of Canberra.

Greyhound passports were no longer issued for Macau

Greyhound Racing NSW said the four men will have the chance to respond to the charges at a hearing expected later this month.

Passports from Greyhounds Australasia are required to export dogs, however the organisation stopped issuing passports for Macau in 2013 because it is not compliant with Australian animal welfare standards.

Passports are also not issued for dogs going to China.

The ongoing inquiry was convened in 2016 after evidence emerged that greyhounds were being exported to China and Macau.

A number of disqualifications and charges have already been laid including against three people last October over the export of 96 greyhounds to Macau Canidrome and 70 Greyhounds to the Shanghai Wild Animal Park.