A man has been seriously injured after being dragged hundreds of metres by his own car when he allegedly tried to stop it being stolen in Sydney’s south-west.

The 43-year-old’s clothes became caught in the passenger front door as the alleged carjacker sped off, forcing him to cling on for dear life as he was dragged almost a kilometre.

The terrifying ordeal began when the man was allegedly carjacked as he left a dog park off River Road in Elderslie around 5.30pm on Sunday.

Hanging off the passenger side of his own sedan, he was dragged 800 metres before eventually losing his grip outside an Elderslie fruit shop.

He stumbled inside, injured and in shock, where Camden Fruit Barn shop owners Steven Gugliotti and Chris Oliverio were just closing up for the day.

“The man’s walked up here and he was bleeding and he didn’t look well,” Oliverio said.

“We weren’t obviously sure what was happening but we knew there was obviously a problem,” Gugliotti said.

The pair called Triple-0 and did what they could to help while they waited for emergency services.

“Gave him a banana, an orange, wasn’t quite sure what was happening,” Oliverio said.

When paramedics arrived, they worked to stem the bleeding from a leg injury before rushing him to Liverpool Hospital.

Police are now trying to work out why this man was targeted and whether it was completely random or something more sinister.

“It’s a dog park. People go there, you know, walk their dog. It’s a friendly place. You know, it’s bizarre that it’s happened there,” local Danny said.

“I consider Camden a safe place. So yeah, it breaks my heart when things like this happen,” another local Jade said.

The man remains in hospital tonight, now in a stable condition.