I've raised £1100 to help fund mitsys vet bill after owners of the dog who viscously attacked her in her own garden refuse to pay ( she’s fighting for her life)

Yesterday my dog, Mitsy, 6 years of age, was attacked by a Japanese akita. My dog is a small cross breed chihuahua/Jack Russell. The owner of the dog has refused to pay for the vet bill which currently stands at 1100 without the surgery she needs. This is life saving surgery and has to be done to give her a chance of living. She has suffered numerous punctures to the abdomen, trauma to the head, bruising all over the body and the worst part is something on her insides has caused swelling at the side of her stomach. Even after all this she continues to try and get up off the operating table. If she's willing to fight, I am too. She's such a loving dog and even had the nurse in tears. I hate to do this but I am without choice as my dogs life comes before pride, dignity and anything else the judgemental people would suggest. Please if you could help my cause and give mitsy her chance of survival, I, and she, would appreciate it more than anything else in the world.