The City of Vincent plans to launch legal proceedings against the owner of two dogs believed to have mauled a smaller dog to death in an East Perth park last week.
City of Vincent chief executive John Giorgi said the owner of the property where they believed the dogs lived was not co-operating and he said the property owner was known to police.
Failing to co-operate with the city's rangers was an offence.
The city was yet to confirm the dogs at the address were those involved in the attack.
"Unless they co-operate, at this stage we will be pursuing legal proceedings against them," Mr Giorgi said.
"We want to hear their side of the story.
"Eventually, the dogs will have to be surrendered.
"These dogs are known to the city and I am extremely concerned that they are a serious risk to the community."
Mr Giorgi said if the dogs were confirmed to have been those involved in the attack, they could face being declared dangerous or put down.
During the vicious attack at Banks Reserve on Thursday, a nine-year-old Westie Maltese called Mr Moo, was thrown around like a doll while its owner watched helplessly.
When the owner approached the owner of the bigger dogs and challenged him, he was told: "You should have got a bigger dog, get over it."
Mr Moo had serious injuries and had to be put down.