She finished by leaving a tribute to her beloved hens: "RIP Honky the head chicken who died protecting her sisters and Khloe our best layer."
Nissen's other chooks, Olive, Mummy and Kourtney, survived.
Hannah Nissen-Ellison, 23, was inside her mother's home on Saturday morning when she heard the five hens squawking.
She raced outside thinking a cat might be on the property. But it was a dog.
"He [the dog] was getting into them. He was just ripping feathers and skin out. The dog looked like it was having fun; it looked like it was a game.
"I could hear this man's voice from the street. He was yelling, 'Do you have chickens? If they've gone up the trees they'll be all right'."
Ms Nissen-Ellison shooed the dog towards its owner, whom she described as white, middle-aged with dark hair. He apologised, but she doubted his sincerity when he didn't stick around.
Ms Nissen-Ellison said the owner had to take responsibility for his dog.
She hoped he would come forward to apologise properly.
She had a warning for the neighbourhood, which is popular with chicken lovers, that they should be more vigilant about their safety.
Owners whose dogs attack people, stock, poultry, domestic animals or protected wildlife can be fined up to $3000.