Help Pay For My 8 Month Old Puppy's Surgery Bills

Due to an unforeseeable accident, while babysitting two boys, my puppy was picked up and dropped by one of them. Their mother refuses to help pay any of the bills despite the fact her son (as I found out after this happened) has a history of injuring dogs. I take partial blame as it was me going into another room that allowed them the opportunity to treat my baby like a toy. I went to the best specialists in my state, so my puppy will be fine and recover in two months unless the worst case comes true. He will be able to live his life normally as well. However, that doesn't erase the 6,000 dollar bill that has been dumped at my feet--one I only have six months to pay through payment plans before interest begins to wrack up as well.