ABC's Four Corners investigation earlier this year has not only led to six parliamentary inquiries, multiple criminal prosecutions and numerous industry sackings — it has also triggered a huge upswing in ex-racing greyhound adoptions across Australia.

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Greyhound Racing NSW Chief Veterinary Officer Dr Elizabeth Arnott said the Four Corners story encouraged huge public interest in the state's racing-industry run adoption program.

"Year-to-date we've re-homed 267 greyhounds, and that was a doubling of figures on last year just as we continued to increase resources into the program," she said.

Dr Arnott said the report also made a significant impact on the racing industry's breeding and re-homing practices.

"As a result of what we saw in February and the focus that's gone on in animal industries in general, we've certainly seen a tightening and enforcement of the greyhound racing rules and regulations particularly in relation to the breeding of greyhounds," she said.

"There are definitely participants who would be unwilling or unable to comply that may leave the industry and choose to put their greyhounds up for adoption."

Adopted greyhound 'Mister T' visits Santa ( ABC News: Lucy Carter )

A year ago, four-year-old greyhound Mr T was a racing dog, living in a cage.

This year for Christmas, his new owner Elizabeth Drysdale is taking Mr T and her daughter Taylor to get their photo taken with Santa at a pub in Sydney's inner west.

"We had a staffy that passed away this year and I was looking to get another dog, but I really wanted to teach my daughter that dogs don't necessarily come from pet shops," Ms Drysdale said.

"So we were looking at rescue dogs, and then one night I sat down and watched the Four Corners report about greyhounds and it really struck a chord with me."

After few weeks of research, and speaking with other greyhound owners, the Drysdales brought home Mr T from Racing NSW's Greyhound Adoption Program.

"A lot of people think 'oh my gosh you've got a greyhound, like you have to exercise him a lot every day', which is untrue," Ms Drysdale said.

"He goes for a good walk and that's it — he sleeps. He's kind of like a big cat."

She has noticed more and more people adopting rescued greyhounds and estimates that there are around a dozen newly adopted ex-racing dogs just in her suburb of Balmain.

"Most of my friends and family though I was completely crazy, but he's the best decision I've ever made," Ms Drysdale said.

"He's the most beautiful, gentle, loving, goofy, very funny dog."

She said that she and the other dog owners who have adopted greyhounds meet up regularly and have even started their own Facebook group.

"It's just a great way to help out these dogs that have gone through such atrocious things in their lives," Ms Drysdale said.

Racing industry 'in chaos' since 7.30 and Four Corners reports

A number of greyhound racers have put up their dogs for adoption since the ABC reports came out into mistreatment, many unable or unwilling to comply with tightened racing rules and regulations. ( AFP: Robyn Beck, file photo )

Peter Flan runs the racing dog re-homing charity, Greyhound Rescue, with his wife Janet.

They currently have six greyhounds in their home in Sydney's northern suburbs, and care for another 80 at a rented semi-rural property and through foster homes.

He said there has been increased interest in the dogs since the Four Corners story.

"I think the racing industry is in chaos these days, since that one and since the more recent ABC 7.30 report [into the exportation of greyhounds]," Mr Flan said.

"We are getting lots and lots of inquiries for people to take greyhounds in."

Mr Flan said that over the past decade they've re-homed more than 1,000 dogs.

He said the expense has nearly crippled them, and they rely solely on donations.

Mr Flan said they would like to see the industry closed down completely.

"There is an inquiry on at the moment and the commissioner has got the chance to recommend that and we would like to hear that he does recommend it," Mr Flan said.

"The amount of total wastage of dogs, I mean anything up to 20,000 greyhounds are euthanised and they're beautiful animals."