Greyhound racers are not taking a ban on their sport lying down, labelling a report, that was the basis for the ban, as biased and seriously flawed.

The report by Commissioner Michael McHugh, has been slammed by the New South Wales Greyhound Racing Alliance, which says the terms of reference were out-dated, inappropriately narrow and biased. The alliance has detailed what it says are errors in the report and is now threatening legal action.

Premier Mike Baird announced a fortnight ago he was shutting the industry down as of July 1 next year following evidence of cruelty to dogs in the industry.

Earlier this week, an independent investigation found around 100 greyhounds has been either shot or clubbed to death in the Hunter Valley because they were under performing. Nationals leader Troy Grant said that evidence was further proof the industry needed shutting down.