Growing numbers of unwanted greyhounds have been adopted across New South Wales since a Four Corners expose on live-baiting.

However animal welfare advocates still want the racing industry shut down, with a national day of action calling for an end to greyhound racing planned for this weekend.

Greyhound foster carer Caroline Ludwig will be attending a rally in the northern New South Wales city of Lismore.

She said she had come across greyhounds exposed to live-baiting before the Four Corners program went to air a year ago.

"If the dogs really have been involved in that, quite a lot their prey-drive is too high to be a normal pet again, so they can be really damaged," she said.

"You can see in their eyes that something has changed and it's not their fault. I feel so sad that it's happened.

"The reality is, by doing that some dogs have been ruined.

"It did surprise me that so many people were shocked [by the Four Corners program], I thought everyone knew that it happened."

Friends of the Hound president Lisa White said her greyhound adoption group, which covers all of New South Wales and south-east Queensland, re-homed 225 greyhounds in 2015 — more than any other year.

"For a small group, that's quite a large number and it's larger than most of the industry adoption programs that are funded," she said.

"Four Corners definitely caused an increase [in adoptions] and the reason for that is possibly because more trainers are seeking alternatives for their dogs with the spotlight on the industry.

"And we're still having a run-on effect with trainers who are bowing out of the industry."

In December, Greyhound Racing NSW chief veterinary officer Dr Elizabeth Arnott told the ABC they had re-homed 267 greyhounds over the year which was double their 2014 figure.

Greyhound wastage still high

However, Ms White said despite the increase in adoptions, the figure was a "drop in the ocean".

The RSPCA has estimated between 16,000 and 25,000 greyhounds as "wastage" from the racing industry every year in Australia.

"Whilst 225 came through our program, there are thousands out there that had very short lives after being bred and exploited for this industry," Ms White said.

"There will never be enough homes for the amount of dogs that are products of this industry.

"There's only so much demand. There are only so many dogs we can have through our program."

Ms Ludwig works directly with trainers in the Casino and Ballina areas of northern New South Wales, who previously had their greyhounds killed once their racing careers were deemed finished.

She said not all of their unwanted dogs found new homes.

"They'll say 'I'm finished with this dog' and they'd be quite happy to euthanase the dog, and I say 'hang on, how about I try to find a home instead?'" she said.

"I took on three at one time and could only find a home for one and I had to send them back to the trainer."

Ms Ludwig, who also runs a boarding kennel business for all dog breeds, said greyhounds were the best of the bunch.

"There's really nothing bad about them," she said.

"They don't usually bark as much as other dogs, they are a lot cleaner and don't get that real 'doggy smell.'

"Their temperaments are just beautiful and they rarely show aggression with other dogs," Ms Ludwig said.

"Ex-racers are not used to just being loved and they're really sweet when they come out of their shell."