Mum Rachel Anderson, 39, was looking her friend Adel Johnson's two young children last Boxing Day when dog Storm attacked.
The massive animal locked its jaws on her face, before pulling her to the floor and dragging her into the kitchen.
It savaged her arm for 45 minutes while mum-of-two Rachel screamed in agony, fearing she'd never make it out alive.
It was only when one of the children STABBED the hound with a knife on the counter she was able to get free - and call police who shot the dog dead, she claims.
Former hairdresser Rachel needed nearly a dozen operations to repair the gaping wounds, and surgeons feared they'd have to amputate her arm, she claims.
But the limb was saved when medics sewed it INSIDE her stomach for four weeks to get new skin to grow back.
Nearly a year on, police have dropped the case but Rachel can't work and is still receiving treatment for her injuries, and unable to use her right hand properly.
Rachel, from Skegness, said: "There has to be some kind of recognition. If you have a guard dog, have a guard dog. This was supposed to be a pet.
"I could see blood everywhere. I could see my face out the corner of my eye. My arm was all ripped open. I could see skin and fat everywhere.
"I remember it dragging me side to side, by the arm. At one stage I thought it was going to release me, but it was treating me like a chew toy.
"It was sinking its teeth in, pulling me around, releasing it a bit to get a full grip again, letting me go to bite again.
"It was like I was a rag toy, moving its head back and forth.
"At some point I let my arm go with it, and went down to the ground with it.
"The noise was horrendous. It was that low growl.
"At one point I had it round the neck with my legs.
"All I could see was this knife on the side, willing it to jump in to my hands. I tried to get towards it, to pull the dog with me. It wouldn't move.
"It was like a horror film."
Rachel and Adel met while working in a convenience store and she offered to look after her then-friend's two kids so her mate could enjoy a night out, on December 26, 2018.
She said when she'd visited Adel's home in Rednal, Birmingham, before, the dog would be shut in the garden, but this time Storm was in the kitchen.
It launched its attack when she went to get one of the children a drink at around midnight.
"It stood up and wagged its tail and I presumed it was going to be fine," she said.
"I opened the kitchen door and it came into the front room.
"I didn't feel scared.
"The boy was jumping up and down on the settee and that's the last thing I saw before it went for me.
"I heard it before I saw it really.
"It was on my face. I screamed. I put my arm out to protect the little boy and next thing I knew the dog got hold of my arm, and dragged me off the settee and into the kitchen where it attacked me for 45 minutes.
"I would sit up and it would pull me down, then I was laying down, then sitting up.
"It got to the point I thought 'I'm going to die here in this kitchen'.
"The only thing that kept me going was my little boy in my head, saying 'don't die, we need you'.
"At first it really, really, really hurt, but then it was numb.
"The bites were kind of numb at some point, but not when it was ragging me. That hurt beyond words.
"It only bit me on the face once, and the rest was on my arm - moving up and down the same arm.
"If it was on the floor, I was on the floor. If it wanted to stand up, I had to come up with it.
"It kept trying to get itself comfortable.
"It was very surreal. I felt like it was settling down to chew down. I found a second strength and started to call on the little girl I was babysitting.
"I didn't want anyone to come home to a dead babysitter. What if it turned on the kids?"
"I was screaming for the kids to help me. In the end it got to the point where I shouted 'do you want me to die here?' "I told them 'you need to come in and stab this dog'."
The attack only stopped when one of the children grabbed a knife which was out of Rachel's reach, and stabbed the dog in the back side, causing it to release its grip, she said.
The dog was thrown out into the garden by the young girl.
Rachel phoned 999 for an ambulance, and then her husband.
She said one paramedic was so horrified he had to step out for air and commended her police officers who attended.
"I opened my hands and all this fat and blood and tissue fell on the floor. I had collected it in my hands."
She said she insisted on waiting to go to hospital until Adel got back.
Rachel said she heard three gun shots when the police killed the dog, before she was taken to Queen Elizabeth Hospital Birmingham.
During nearly two months in hospital she had ten operations to clean the wound, stitch it up and carry out skin grafts.
She caught a severe infection which "ate" her arm muscle and had to take antibiotics for 12 weeks.
The skin grafts from the top of her arm refused to take, and doctors feared they'd have to amputate.
In an last ditch attempt to save the limb, surgeon Rajive Mathew Jose cut a flap in her stomach and sewed the arm inside for four weeks - to allow new unharmed skin to grow over the top.
"It felt so weird," she said.
"My balance was all off and people were staring at me. I also had this scar down my face. And if I moved too much it felt like it was going to rip open."
She initially gave statements to the police but after 10 months was told the CPS didn't want to progress the case because the dog was killed, she said.
"I didn't want to keep going through it with the police because I wanted it to be over, but I did it because I wanted what had happened to be recognised," said Rachel, who has scarring on her stomach, arm and face.
"It's hard to take. I feel like I have been screwed over.
"I feel like everyone else is just getting on with their life, but I've got to live with this for the rest of my life.
Rachel is right handed so now can't write properly.
"I've had to pack up work," she said.
"I've got to look after my kids without being able to work.
"I could have been dead.
"The nightmares - I have had nightmares since that day.
"I have been put on antidepressants to keep things at bay. My four-year-old daughter has anxiety about me going anywhere."
West Midlands Police confirmed the case was closed, with no further action.
A spokeswoman said the decision was made by the CPS who felt "there was insufficient evidence to provide a realistic prospect of conviction".
Adel said she did not want to comment.