More than 370 racing greyhounds were put down in the last year, which is "shocking" and unacceptable, given about 600 are bred each year, the WA Greens have said.

New figures released in the WA Parliament revealed 371 greyhounds were put down in the last 12 months because they were too slow, injured or deemed unable to be re-homed.

Questions to the Minister for Racing revealed 187 dogs were euthanased because they were injured on the track or while training, 96 were not suitable for racing, and 88 were deemed unfit for re-homing since October 2015.

About 600 of the dogs are bred each year in WA, while about 400 are imported from interstate for racing purposes, with 2,019 imported into WA since 2012.

The number of dogs exported from WA to be raced in other states has also increased significantly since 2012.

Greens MLC Lynn MacLaren MLC has said the figures were "shocking" and revealed ongoing systemic cruelty within the WA greyhound racing industry.

"We already knew at least 800 dogs were euthanased in the two years up to the end of 2014-2015," Ms MacLaren said.

The industry rehoming group GAP has rehomed 120 greyhounds in 2015-16 with about $200,000 funding.

The Racing and Wagering annual report released on Thursday showed the industry provided $11.7 million in 2015-16 for around 300 race meetings.

The greyhounds that were euthanased were deemed too slow, injured or unable to be rehomed. ( ABC News: Laura Gartry )

The latest figures come after the RSPCA recently launched an extraordinary attack on the WA greyhound industry, labelling it "highly secretive" over its refusal to release historical euthanasia figures.

RSPCA WA had previously stood by industry's ability to self-regulate, but has since called on the WA Government to set up an independent welfare and integrity body to oversee the industry.

The RSPCA, Labor and the Greens have been asking the industry to tell them how many dogs have been put down over the last decade because they deemed unsuitable.

But Racing and Wagering WA (RWWA) will only provide the figures for the last three years, citing the data would need to be recovered.

RWWA has continually refused to dedicate the resourcing they claim is required to provide the figures.

Ms MacLaren said the latest figures show the industry has something to hide.

"It is little wonder the industry has been reluctant to admit to the true number of otherwise healthy dogs which have been historically euthanased."

Racing Minister Brendan Grylls and the RWWA have been contacted for comment.