Persian cat

　　Some dogs and cats have quite obvious overweight features while others are not easy to judge. Weight is a useful indicator, and it is generally considered overweight if an animal’s weight exceeds its normal ideal weight by 15%. The standard weight of purebred dogs can be an effective basis to determine the "ideal" weight, but it may not apply to mixed breeds. Most healthy cats weigh between 3-5 kilograms, but some large-boned cats, especially neutered male cats, can weigh much more.

　　In a normal animal, you should just be able to feel the ribs under a not-too-thick layer of fat, and when viewed from above, you should see a distinct "waistline" behind the rib cage. Overweight animals lack a waist curve because the fat layer beneath the skin thickens. Cats usually store fat in the groin area, forming a "apron." Overweight dogs and cats have a distended belly due to the accumulation of large amounts of fat in the abdomen. Veterinarians will distinguish whether the distended belly is caused by overweight or other factors such as pregnancy, ascites, or enlargement of abdominal organs. (Source：PetsZone)