A group of Border Collies have been killed by the RSPCA in South Australia after they were unable to recover from severe mental trauma from their previous owner.
The RSPCA released a statement saying: "Everyone would have wished for these dogs to have lived full lives free of anxiety and stress.
"But very sadly, these four dogs have now been euthanised on the basis of compelling expert consensus that this was the best course of action to relieve the suffering of these animals.
"This was a heartbreaking decision for RSPCA staff who have cared for them over the past five months."
Five puppies and heavily pregnant dogs were rescued from a property last October, with breeders Colin Ross and Kerrie Fitzpatrick charged with 17 offences relating to mistreatment of animals.
More than 300 dogs were found on the property, despite the owners only having a license to have 100.
People have been trying to save the dogs from being euthanized, with more than 50,000 people signing a petition to be moved.
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