A woman suffered horrific injuries after being attacked by a pitbull while walking her dog.

The victim, known only as Alison, was walking her pooch 'Twiggy' near her home in Swan View, Perth, on Friday when the pitbull attacked her.

The pitbull had no collar on and there was no sign of its owner.

'As soon as it saw my little dog it crouched and, before either of us could move, it was on us,' she told 7 News.

The horrific injuries Alison suffered in an unprovoked attack by a pitbull in Perth

She said the attack lasted for five agonising minutes.

'I picked my dog up to try and stop it from being attacked and the dog started bouncing up at us and biting, so it took a few chunks out of the little dog.

'And then I spun around and it latched onto the back of my arm.'

Alison said she had to had to spin to get the dog's teeth out of her flesh.

'When I finally got it off, I started to scream for help and run - I just kept running.'

Neighbour Nathan Ashby rushed to Alison's aid when he heard her shriek in pain

Alison said blood was pouring down her arm and onto her clothes.

Neighbour Nathan Ashby said he heard her 'shriek' and ran to help.

'Flesh hanging out of the wounds in her arm and blood trickling down her arm. It was pretty horrific,' said Mr Ashby.

Alison said: 'As soon as saw my little dog it crouched and, before either of us could move, it was on us' (stock image of a pitbull)

Alison was taken to Midland Hospital before being transferred to Royal Perth where she had surgery.

Twiggy had puncture wounds to his stomach and was given antibiotics and painkillers.