​If you're unsure what your pet's optimum weight should be, perform this simple test at home:
Place your hands on your pet's rib cage with your thumb on the back.
  • If you feel your pet's ribs easily, your pet is probably at a normal weight.
  • If you can feel some fat between the skin and ribs or if the ribs are difficult to feel, your pet is overweight.
  • If you can't feel the ribs, your pet is definitely obese.

​In some pets, particularly cats, a large abdomen that hangs down may indicate obesity.  It's important to have this judgment confirmed by your veterinarian; he or she can rule out other dieases that look like obesity such as heart, kidney, or glandular disease.