Please help save Rocky

Hi, my name is Nene, iam Rocky's mum. Rocky is our very loved family pet, he is his dad's reason to breathe. Rocky is normally a very happy playful guy. But five weeks ago he stopped eating drinking and became very lethargic. the vets did tests and said it was possibly a urine infection and gave him antibiotics. He perked back up for a few days but then crashed back down so the vets gave him more antibiotics but there was no change. Port pirie vet said they didn't have the facilities to test further so Rocky was rushed to roseworthy vets in Adelaide. He had an altrasound done this morning and they found a mass near his spine, he had a biopsy done and they said he needs an operation to have it removed. We have already spent thousands and can't afford the operation, we are scraping every cent together as we can, we don't care that we can't afford Christmas this year. Our boy means so much more to us! Please even if you can only afford a few dollars, we will be forever grateful!