Please help with Lucas's recovery

Our sweet boy, Lucas, was in our backyard fence with his 2 sisters. Two dogs from the neighborhood escaped their yard and came over to our yard trying to fight. Lucas stuck his head through the fence and was attacked by both of them. When my daughter heard the noise and got there, she saw them both attached to his head trying to tear him apart. She tried to get them off of him, but one finally let go and she had to jump in the car to avoid getting bit herself. She drove the car up next to the fence so they couldn't reach him. Lucas is currently at the vet having surgery to repair the damage. Due to some recent health issues, we don't have the funds to cover his bill. The owner of the dogs is trying to help, but he doesn't have it right now either. I hate asking for help from anyone, but for my sweet boy, I have to. I'm sorry the photos are terrible to lok at. I tried to choose the least sickening ones. Any help will be appreciated. Thank you!