My beautiful girl suddenly lost a lot of weight and was diagnosed with kidney cancer this morning. One kidney isn't working at all. She has a cough too and the vet thinks she maybe has lung mets.
She's only 10. I'm so sad, and it's so sudden. We lost another cat to cancer only 3.5 years ago - he went from diagnosis to PTS in 5 days. I feel I should have noticed something but she was fine until a week or so ago. In fact even last week, although she was looking thin, she caught two mice and presented them to DH 
The vet gave her subcutaneous fluids because she was dehydrated and said we should repeat this 2-3 times a week. They said I can do it at home - I've looked at some YouTube videos, mostly of remarkably docile cats! I'm not sure we'll manage it because I know she'll struggle and try to escape... but she finds the vet trips quite stressful too. I'm going to take her on Monday and they'll show me anyway (DH took her today). Cortisone is an option too.
I don't think she's ready to go yet... still eating (mashed up tuna is a hit!) and enjoying the outdoors. I just worry that the stress of treatment will outweigh the benefits for her. And I doubt she has very long... weeks I imagine. The vets are very nice but I do think they can be unrealistic... they mentioned the possibility of chemo for my other cat but there's no way he was strong enough and he was too near the end.
Not sure what I'm asking really but a handhold and any experiences with kidney/lung cancer appreciated.