My 11 years old cat died yesterday after 12 hours in pain. She has been lethargic for about 1 month now, but I really thought that was a result of her aging. She was occasionally puking, mostly unprocessed food. Yesterday she started puking but just liquids, greenish and with some foam. She was really in pain and she started breathing with her mouth open and tongue out. We took her to the vet which told us that was probably a kidney failure and run some blood test on her. Then he sent us home with the cat telling us to come back the other day, he didn’t realize it was an emergency. We took her back home but the situation got worse. She puked more, the pain got worse she didn’t have any energy at all. So we rushed to the clinic again at 1 am. The vet did some x rays on her, and told us she had something near her stomach but he couldn’t tell what it was. It could have been anything from a tumor to a hairball. He thought it was best for her to stay overnight. She was in very bad conditions, he just injected some pain killers to her. She died three hours later. I feel so bad for letting her there. I just can’t believe she is gone like this. Another vet that saw the blood test and the x rays thinks it neither kidney failure nor tumor or hairball. I’m devastated. What could it possibly be that killed my cat?