My cat isn't very old, but we don't know for sure because he is a rescue. Took him to the vet yesterday, because he wasn't eating, and he was hiding away from me, which isn't like him. I carried him and he felt quite weak. His ears felt quite warm, his gums looked quite pale and his breathing sounded a bit fast and hard. Took him to the vet where they put him on oxygen, and gave him steroids. They did tests and scans, but found nothing obvious. He's been losing weight, and his red blood cell count is very low. The vet said something weird is going on, either an infection or a cancer that they can't see on the scans and tests. He offered to euthanise him there and then, but I couldn't do it, as the oxygen had perked him up and he was purring and making little biscuits on his blanket. I decided to bring him home and try to treat it as an infection, but the vet wasn't hopeful that he'll get better. He did eat at home, and I tried to give him his antibiotics. I thought he had taken them, but found later that he spat them out. He's been drinking a lot of water, and weeing a lot. He's just been laying and sleeping on my son's bed. I think that I know deep down that he's not going to get better, but I'm finding it really hard making this decision