New South Wales Premier Mike Baird has written a Facebook post defending his Government's controversial decision to ban greyhound racing.

In a lengthy response to thousands of social media comments, the Premier denied suggestions the ban was to allow Wentworth Park in Sydney to be sold to developers.

"We don't have any say over who the privately owned tracks get sold to.

But, for the government-owned sites - including Wentworth Park - I can't be any clearer. They will be used for community space."

He said whatever loss of life came as a result of the shutdown, it would be a fraction of what would happen if the industry continued although he admitted rehoming greyhounds would be a huge challenge.

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"I'm open to any approach to save as many dogs as we can. But the report is very clear - tens of thousands of dogs are being systematically killed, often in inhumane ways, simply for not being fast enough," he said.

Mr Baird also denied the ban, set to be implemented next year, had been a hastily made decision in response to the ABC Four Corners report which exposed live-baiting in the industry.

Many Facebook users responded to Mr Baird's positively.

"I don't support all your decisions, but I support this one, and I think you have publicly addressed it well," said one man.

But others expressed disappointment at the reach of the state Government into another area of public life.

"The nanny state gets worse!," one user sad. "You have lost my vote old mate!"

Racing is due to resume next week but the announcement to ban the sport has sent shockwaves through the industry.

Thousands of jobs 'will be lost'

Mid-north coast trainer Shane Watkin has told ABC local radio he does not know what to do about the future.

"We're just beside ourselves, we just don't know, we don't know," he said.

"It's meant to be a democracy ... but it's like a dictatorship, we don't have a say, like 18 months, we're doing the reforms that they wanted us to do.

But Dr Jed Goodfellow from RSPCA Australia said it was an industry that could not continue.

"It is simply not acceptable in the 21st century to be putting thousands upon thousands of dogs to death for the purposes of sport and entertainment and gambling," he said.

The industry has vowed to fight the Baird Government's ban, with talks at Dapto and Wallsend today following a crisis meeting on Saturday.

At Sydney's Wentworth Park, the Greyhound Breeders, Owners and Trainers Association said a legal challenge was the only way forward.

State secretary of the AWU Russ Collison believes 5,000 people will lose their jobs, with people in regional areas hardest hit.

"I'm talking about thousands of hardworking Australians around NSW and country and regional areas, where unemployment is normally at least twice the level of what it is in the metropolitan area," he said.