A shattered dog owner has described the horrifying moment his little black poodle named DiDi (pictured) was killed

A shattered dog owner has described the horrifying moment he witnessed his little black poodle being mauled to death by a pit bull.

Tom Chen had been walking his dog DiDi in Roy Amer Reserve in Oakden, Adelaide, around 7.15pm on Wednesday when the fatal incident occurred.

Mr Chen claims a pit bull more than three times the size of DiDi grabbed him and started biting him multiple times in the unprovoked attack.

'[The pit bull] just kept on biting, again and again everywhere. He wasn't going for the throat, it was like he wanted to kill him slowly,' Mr Chen told The Advertiser.

'I've been having nightmares about DiDi getting killed. It's flashbacks and it just keeps coming back,' he added.

Following the brutal attack, the dog and its owner fled the scene.

While Mr Chen said he initially gave chase, he stopped so he could tend to a severely injured DiDi.

DiDi was taken to a nearby veterinary surgery where he received an X-Ray and told he needed emergency surgery.

The image shows the alleged dog owner and the alleged pit bull fleeing the scene in the park

Mr Chen (pictured) warned that other dogs and small children would not be safe in the area

Sadly DiDi suffered a cardiac arrest before he could undergo the operation.

Despite the best efforts of the medical staff DiDi passed away.

Mr Chen warned that other dogs and small children would not be safe in the area while the pit bull was still roaming the streets.

'It will kill again. There were kids there yesterday, they would be killed by this dog. The owner is an idiot. Turn yourself in and put the dog down,' he cautioned.

Port Adelaide Enfield Council confirmed an investigation into the fatal dog attack is underway.

A spokesperson for the council asked for public assistance in identifying the owner of the killer dog.

They also said they were seeking the person to come forward and assist with the investigation.

Anyone with information is asked to phone Port Adelaide Enfield Council on: 8405 6600.