Can you please help us help Bear?

Our little Chihuahua Bear was attacked 2/1/14 by a large German Shepard. Bear is only 12 pounds. Bear was on a leash and the Shepard's owner was not holding her dog's leash. This happened in the blink of an eye. We can not locate the owner's. Our little guy sustained massive injuries and is fighting for his life at Massachusetts Veterinary Hospital in Woburn. He has had abdominal surgery and numerous procedures. His doctor's say he needs a lot more time and TLC in the hospital in order to get better. He may also need another exploratory abdominal surgery and a Cat Scan. We have run out of money to keep going. The doctor's think he has a fighting chance to survive but just needs more time under their care. He is the sweetest little dog and loves life. Can you please help us so we can get our boy home and healthy? Bear loves the summer time and loves basking in the sun. We want him to come home so he can have a wonderful summer and over come this horrid attack. He was SO SO excited to go out for a walk (he hadn't been on a walk for a while since we just had our first baby a few months ago). It was a sunny mild day so we thought it was a great idea to take the dogs and baby out. Within a minute or two of our walk Bear was attacked. We do not want anything bad to happen to the Shepard. We want the owner's to be more responsible so this does not happen again. Our heart's are broken seeing Bear go through this. Can you please help? Even a few dollars will help.