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A beloved family pet is fighting for her life and a shattered family has issued an urgent warning to others to watch out for a man with a pack of hunting dogs frequenting the park where their animal was attacked.

The horrific attack on the family's precious pooch Molly was unleashed as her owners were walking her through Nan MacMillan Reserve in the eastern Perth suburb of Darlington.

In a Facebook post, Molly's shocked owner Brooke Finning said they had been walking the 12-year-old dog near Helena College on Thursday afternoon, "as we do every day".

She said a man in white Hilux ute had turned up and "unleashed" five hunting dogs, "one of which attacked Molly tearing at the skin around her neck".

Serious surgery

Finning wrote in her post that they had then taken Molly to the vet where she had undergone surgery to address her injuries.

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"At 12 years old we were unsure she would survive .... Thank you to the wonderful staff at Swan Veterinary Hospital in Midvale for staying open to help Molly," Finning wrote.

The family has set up a GoFundMe to help with Molly's medical bills and will donate any funds over that amount to the RSPCA.