Trents leg surgery

Hi! I really hate to do this but I am in desperate need of help. A couple of months ago my baby Trent was playing and hit his leg hard into a wall, every since then he either limps or isn’t using it at all. I’ve just taken him to the vet today and found out that he needs surgery because he tore a ligament. If you know Trent, you know he’s the most energetic and sweet boy ever! I would love to be able to take him back to the dog park and on hikes again, I hate seeing him in pain and I hate seeing him stuck in the house. Our only other option is pain meds for the rest of his life and those alone are $100 a month. I wish I could cover these funds on my own but with my mental health issues recently I’ve had to put all extra money towards that, and I’ve also been missing work. Anything helps, thank you so much.