Liver Surgery for Noodle

I just want to start off saying thank you to anyone that can help I have never done this or asked for help before like this. But all of this came on out of nowhere.  I six month old Labradoodle we just bought was so full of energy and are family has come to love him dearly. Over the last few weeks we noticed is his eating habits had gotten less and less. So we decided we needed to get him checked up at the vet. After the vet appointment we where told that he had what is called a liver Shunt, so everyone has a better Idea of what a liver shunt is it occurs when an abnormal connection persists or forms between the portal vein or one of its branches, and another vein, allowing blood to bypass or shunt around the liver. In the majority of cases, a liver shunt is caused by a birth defect called a congenital portosystemic shunt. We where told by a specialist that he would need surgery asap. So we are supposed to take him to Portland next week for the surgery.  The people we bought the dog from where kind enough to offer the money back for are dog to help pay the bill for the surgery but Im having a hard time coming up with all the money we need for the surgery. the cost for the surgery can be anywhere between 3500-5000 dollars. Anything anyone can come up with would be amazing and helpful but if you cant help don't feel bad I understand that not everyone can give. 

Thank you, Joseph Biamont