Yes - obesity, defined as an excess of body weight of 20% or more, is the most common
nutritional disease of domestic cats. Although the frequency varies from one country to the next,
known about the detrimental effects of obesity on feline health. Obesity in cats humans, obesity
mellitus, certain types of cancer, impaired mobility and arthritis, high blood pressure, heart
disease, and other illnesses. Recent studies suggest that heart disease also occurs in obese cats!  
More research is needed to evaluate this and to determine what other detrimental effects obesity
has on cats.

Finally, obesity in cats is associated with hepatic lipidosis. This is a severe form of liver failure
in cats. It typically occurs in cats that are obese and have undergone a brief period of “stress”
which causes anorexia. The “stress” may be as simple as a change of house or a change in diet.
Hepatic lipidosis previously was an almost universally fatal disease in cats. Fortunately, with
improved, aggressive and prolonged therapy about 80% of affected cats can now be successfully
treated. However, because of the risk for this potentially fatal disease, the treatment of feline
obesity needs to be done cautiously and always under the care of a veterinarian.

What causes obesity in cats and how should it be treated?

Many factors contribute to obesity in cats, and not all of them are clearly understood. Some are
probably genetic, while others are clearly related to diet and environment. It is important for the
cat owner and veterinarian to keep these factors in mind when treating the obese feline patient.
Prevention is better than treatment, but this is not always easy. Indoor cats are more prone to
obesity, perhaps because they eat more out of boredom, but also because they have less
opportunity to stay trim through exercise. Remember that everybody should run and play,
including cats!  

Once a cat becomes obese, the challenge for owner and veterinarian is to safely promote weight
loss and maintain optimum weight. In the long run it is better to set realistic goals for weight
reduction rather than attempting to force the cat down to a “normal” weight. Usually a 15-20%
reduction in weight is a good target that can easily be achieved!  Rapid weight loss should be
avoided, since it puts the cat at risk for development of severe liver disease. Weight that is lost
slowly is more likely to stay lost!  There are no drugs or magic pills that can be used safely or
effectively. Commercial “low-calorie” diets are available from veterinarians and provide the
basis for a successful weight loss program. However, they are more effective when combined
with additional exercise. This also has the advantage of providing more time for interaction
between the cat and the family, which we know provides enjoyment and is beneficial for the
health of both. With some patience and extra care, obese cats can be treated safely and
effectively, with the ultimate goal of prolonging a healthy happy life!
This client information sheet is based on material written by Ernest E. Ward Jr., DVM.
© Copyright 2002 Lifelearn Inc. Used with permission under license. September 30, 2009.
Cambridge VetCare
Animal Clinic, PA
Cambridge, MN