My 9 year old cat has been losing weight slowly. Her size makes her look like a kitten. Her fur is very thin and is always cold. She lays on the heat register in my room all day. She has lost the hair un der her tail and in her private area under the tail. She seems more tired but she eats, drinks and acts like a normal cat. This has been going on for 8-10 months. She isn't suffering at all and the vet said it would cost us a lot to just find out what was wrong. He is very puzzled that she still eats and goes to the bathromm normally. We haven't taken her to the vet because we are on very limited income. What should I do?