Loch Sport Department of Sustainability and Environment registered volunteer wildlife carer Donna Jones said injured kangaroos were left "in agony'' as there was no authority who would humanely kill them.

"The issue is that Loch Sport is classed as a residential area, rather than rural, so you have to be fully licensed and registered to shoot an animal,'' Ms Jones said.

She said she had contacted various local authority groups, including the DSE, police and RSPCA, but all had claimed it was not their responsibility to shoot injured roos.

"(Recently) I received a call out to a mother kangaroo carrying a joey that had a broken leg,'' she said.

"It was in a residential area and the people were very distressed.

"There was no responsibility, no one would come and help.''

Ms Jones said the kangaroo went missing for 11 days and when found, its leg was severely infected.

"It ended up being clubbed to death by someone to put it out of its misery, because no one was allowed to shoot it,'' she said.

"It's not the first time something like this has happened.

"There are kangaroos being hit by cars and injured in the town and we can't do anything about it.

"It wouldn't be allowed to happen at somewhere like Sale, so why should it be allowed to happen in Loch Sport?

"Things need to be changed so the police officer in Loch Sport, or someone else in the town has the authority to shoot them.

"We need a way to deal with the situation.

"I can deal with smaller animals, but there's nothing you can do for a kangaroo if its leg is broken, it needs to be killed humanely.

"It's distressing for the animal, distressing for the people in town and potentially dangerous.''

Sale Police Leading Senior Constable Adrian Crozier said it was the responsibility of police to put down injured kangaroos, but they weren't always able to.

"Generally police respond to these call outs, we are usually pretty good,'' he said.

Leading Senior Constable Crozier said police sympathised with injured wildlife, but also needed to prioritise their responses.

"We don't always have someone free to send out to put down a roo, sometimes we can't get there,'' he said.

"We do have to prioritise, if there are other things going on sometimes people's lives and property are more important.''