I just lost my cat shadow last Wednesday. She was 15 years old. Her sister Gracie has been losing weight. In last couple weeks down from 8.3. To 7 pounds and we've done all kinds of blood test. Not sure why she won't eat if she is sad about her sisiter. Nor I'm going to lose her as we'll. my vet said if she won't eat in couple days it is time for her. I'm so sad. That it will be