I can’t afford to keep the only family I’ve got left. How do I say goodbye to him?

I broke down crying at work like a baby knowing I may have to put my dog down tomorrow.

I dont know where to begin, I feel like a fucking failure. My dog has been on the care of the vet for a few days now after post surgery complications. Drained all the savings that I’ve left for the past 2 months since he’s been in and out of the clinic just this year alone. Got the bill and it was more than I could afford. Everyday he stays there, I get charged and I’m thinking of putting him down since I cant really afford the bills anymore but I dont think I’m strong enough to do that.

I wanna fight for him coz he’s the only family I’ve got left. I’ve starved myself a lot for him and stopped commuting to work just to afford his meds. I don’t know what to fucking do, I’m not ready to let him go but at the same time vet bills are too much for me right now.