One way to measure if you cat is fat is by gauging the fat coverage over the ribs. Veterinary experts have a simple trick: Compare your cat’s ribs to the knuckles of your hand. Hold one hand out, palm facing down, and run the fingers of your other hand across the knuckles. A cat with a healthy body condition will feel similar over the ribs. Next, turn your hand palm facing up and run your fingers on the knuckles in your palm – if your cat has a similar definition or less across the ribs, he is likely overweight. Finally, run your fingers over the knuckles with the hand in a tight first. If your cat’s ribs feel this defined, your pet is likely underweight.