Bruce Is In Pain

My two year old dog Bruce is in a lot of pain bless him, he has arthritis in his elbows and needs further surgery to stabilise his joint on his hind left leg. His Cruciate Ligament has become partially ruptured and we do not want to leave Bruce hobbling. He recently had both of his ulnars cut to relieve pressure on his elbows and wrists however the damage to his elbows is more extensive than first thought. I have exhausted all my insurance and own funds on his previous operations that has cost over £4000 but wish to continue his treatment as I want him to have as little pain as possible for the rest of his life. His elbows will only get more painful and with a back leg being left unstable would be cruel and would mean he would have to be put to sleep at a young age.