Woman's arm severed in vicious dog attack

A woman in her 30s sustained significant injuries to her arm which is believed to have been severed during the attack.

She was rushed to Townsville University Hospital.

Police attempted to subdue the dog but were unsuccessful and it was "euthanised" at the scene.

Officers said investigations into the attack are ongoing.

It follows another attack in a Melbourne backyard on Thursday where a woman was critically injured and the three dogs responsible fatally shot by police.