I have two cats Tom and Jerry well Jerry is a chubby cat and Tom has always been a normal size cat. Well starting about July 2010 we noticed Tom was losing weight. His personality has stayed the same the other difference is, is that he CONSTANTLY begs for food. He wants whatever you are eating. I finally took him to the vet in January 2011 because he wasn't gaining any weight. We paid 300 bucks and had them do all kinds of blood tests and they said everything was normal. They said he has a slight bit of blood in his urine but nothing to worry about. He is so bony and his ribs stick out and he never lays on his side. I don't know what to do. I don't wanna go back and pay another 300 bucks but I don't want him to die either. His brother jerry is fine, he is actually gaining all the weight Thomas lost. When we took him to the vet Tom weighed 7 lbs. Has this happend to anyone else's cats?