Greyhound Moroccan Miss was killed after sustaining an injury during a race at Mandurah on Thursday, May 7.
The two-year-old was approaching the home turn in race two before a collision sent her crashing into the barrier, resulting in a fractured left foreleg.
She was immediately attended to by an on-course veterinarian, who made the decision to euthanise the dog.
A Racing and Wagering Western Australia (RWWA) spokesperson said the decision was made in the "best interest" of the greyhound.
"Due to the nature of the injury the decision was made by the Veterinarian as being in the best interest for the welfare of the greyhound, due to the poor prognosis for future quality of life," they said.
The decision was met with outrage from the Coalition for the Protection of Greyhounds (CPG), with WA divisional manager Andrea Pollard labelling it horrific.
"Moroccan Miss died a typical greyhound death - running at high speed around a curved track where dogs collide, then lose control and fall," she said.
"Moroccan Miss's smash into the barrier was particularly horrific and highlights the brutal nature of this industry."
RWWA currently provides two injury recovery schemes for greyhounds.
The first offers financial assistance to cover the cost of veterinary treatments, or alternatively the trainer and owner are able to sign over the ownership of the greyhound to RWWA, where all veterinary costs are paid for, and once recovered the greyhound is rehomed.
But the CPG claims many still find themselves in the same situation as Moroccan Miss.
"While the government claims WA has the safest animal welfare-wise industry in the world, dogs are still being injured," Ms Pollard said.
"Industry-funded research done by the University of Technology Sydney in 2017 recommended straight tracks and six-dog races, instead of the usual eight to reduce injuries and deaths, yet little has changed."