The euthanasia practices of Gloucester Shire Council were revealed by a witness to the shootings, Keith Whittall, News.com.au reports.
“I was up at the tip and the ranger came in with these dogs on board,” he said.
“I watched this bloke drive down the back, I heard the ‘pop, pop, pop, pop’ of him shooting the dogs, then he drove over to the general waste and just threw them straight off the back of his ute on to the household rubbish.”
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RSPCA chief inspector David O’Shannessy said the matter was under investigation to determine if the killings were humane.
“The fact it doesn’t sit well with public perception or the community’s attitude doesn’t mean they’ve committed an offence,” he said.
The council’s planning and environment director, Graham Gardner, said euthanasia by lethal injection had been considered, but there were too many problems with training, obtaining the drugs and maintaining a site.
“So the process was abandoned and shooting was accepted as the process that would occur,” Mr Gardner said.
“It’s not something we do regularly.”