I had my 12 year old cat put to sleep yesterday and just feel terrible about the whole thing. He had been struggling the last couple of years limping and unable to go downstairs. He also vomited and poohed a lot around the house. He went to the vet for regular cheeks but they didnt find anything wrong. Last week I noticed he was looking swollen around his front legs and was breathing a but fast but I didn't think much of it. We went away for 5 days and had our regular pet sitter. She said she didn't see him when she visited but this isn't unusual as he also used to go off to the neighbours to get food! When we came back I found him in the garden really struggling to breath and with s swollen tummy. We rushed him to the emergency vet who drained fluid from his heart and lungs which made him feel better but he still couldn't cope without oxygen. They ran tests and said it was most likely cancer and they could treat him but most likely the fluid in his lungs would return quickly and we would have to bring him back in to be drained again. I made the decision to put him to sleep but feel terrible u made the wrong decision. I also feel.terrible I didn't notice how unwell he was before we went away and that he suffered alone for 5 days. I had noticed he wasn't eating but thought it was because our elderly neighbour was feeding him. I can't stop crying.