Levi's ACL surgery

Levi needs imediate surgery for a ruptured ACL. He is not only my best friend, but a best friend and service dog to my Autisitc son Anson. We rescued him 6 years ago from a puppy mill type situation, as a puppy. He naturally took on the role of assistance dog, and we can't bear the thought of him living the rest of his life in this kind of pain. I talked to his vet this morining and his total cost will be about $5,000.00. If there is ANYTHING you can give to help with this huge unexpected expence, our entire family would be eternally grateful. Thank you.