Support Surgery for Our Loyal Dog

My dog has a stage 3 infection in his mouth and the surgery prep and surgery is very expensive. He’s 11 years old and just the surgery prep itself is $2k. They have to make sure he’s fit for surgery, so they are taking blood tests, X-rays on his chest, mouth, and heart. And then the surgery is another $1.5-2k. I’ve already paid $900, but if anyone could help out, it would be absolutely amazing.