New South Wales RSPCA is appealing for information after two red-necked wallabies were shot with target arrows in Kempsey on the state's mid-north coast.

Last week, wildlife rescue group For Australian Wildlife Needing Aid (FAWNA) contacted the RSPCA to report sightings of a wallaby that appeared to have been shot in the neck with an arrow.

Efforts to catch the animal were unsuccessful and it is believed to still be roaming the area.

On Tuesday a second wallaby was found with similar injuries, and after being assessed by a veterinarian, was humanely euthanased.

Mid-north coast RSPCA regional inspector Andrew Kelly said it was likely the two wallabies in Kempsey were shot by the same person or group.

"Indications are at this stage that it is probably the same person," he said.

"These wallabies have been found within a one to two kilometre radius of each other and the arrows we've retrieved are the same."

Mr Kelly said the arrows were target arrows, rather than professional hunting equipment.

"It's a totally different head on them to a hunting arrow," he said.

"The problem is they don't actually do much damage on the way through, and that can mean the animal dies a long, slow death."

Mr Kelly said he was at a loss as to the perpetrator's motive.

One injured wallaby is still roaming in the Kempsey area. ( Supplied: RSPCA )

"I can only think that it's a deliberate act to either hurt or try and kill animals," he said.

"Whether it's kids messing around we're not too sure at this stage.

"We get at least three or four cases like this a year [on the north coast], where animals like ducks, pelicans or kangaroos are shot with a bow and arrow and left to die a slow death."

He said anyone who spotted an injured wallaby or had more information about who was involved in maiming them should contact the RSPCA or Kempsey Police Station.