Help Leo Fight

My puppy Leo is a month shy of his 2nd birthday. I work nights and on my days off he stays with me all night. He brings me his little red ball and we play fetch. He loves to nap on whatever couch I'm on, just to make sure he's right there with me. When I come home, he's the first to the door to jump up on me. He's the kindest little puppy and he's always happy. On Wednesday, 07/26/2017, he was bitten in the face by a large rattlesnake while playing outside. My wife and I rushed him to the animal hospital and his face began to swell as we arrived. He was given anti-venom and a lot of other medications to keep him stable. Leo is a tough puppy. As we reached the end of our available money, a decision was brought before us. Leo is stable. He is able to go on walks periodically to use the bathroom. He has not whined once. Though his head has become heavy and it's become difficult for him to see through his swollen face, he remains happy. The decision was - can you afford to keep giving Leo the medicine that is required to allow him to keep fighting? How can I let him die because I didn't try to find the money? We have already each taken out a pet care credit loan and we are over the amount of our combined credit. This puppy isn't giving up. I can't give up on him either. Please help us give Leo a fighting chance.