Vulcan needs surgery

Over the past 9 months we have been hit with significant Vet bills. One of our dogs Nina was almost killed by a massive infection - 5 days and constant stays at the emergency vets and $3K later she pulled through. Then Vulcan (a rescue dog) tore his cruciate ligament. $5K and 4 months later he had been given a clean bill of health. In April we took out Pet Insurance given these massive bills. Sadly this morning (Sunday 13 June) Vulcan tore his other cruciate ligament - 21 days before his stand down on the insurance ran out. So we have another $5K vet bill coming - and we are tapped out. We need help please.