We lost our 6 yr old persian cat last Monday to a heart attack. We had been treating him for a herpes virus and thought that was why he was so sick and so thin and not eating. We had no idea the reason he was not getting better is because he had a bad heart. The vets did not know either. We found out from the emergency room vet when he arrived DOA. I feel I should have known because both his sisters died young too. One was only 8 months old and never grew past 1 1/2 lbs and could barely walk. The other sister also had heart failure and died at age 2 while we were at work. The symptoms were so subtle I had no idea she was sick. I am so devastated to lose another cat, such a young cat. It feels so unfair to the cat to have such a short life. Last year we lost two other cats to heart failure. One was 9 yrs old and had been sick his whole life and the other showed NO signs of illness and died suddenly and he was only about 5 yrs old. I don't know how much more cat loss I can take and remain sane. I still have a lot of cats but that does not make it any easier because they are all special. I have lost cats that are older and it's not easy but it is so much harder when they are so young.