Obesity in Cats

Obesity in Cats

By: Dr. Rebecca Remillard

Section: Information In-depth

There are several causes of feline obesity, but whether your cat is overweight because of overfeeding or because of a disease process, she is still taking in more calories than she is using.

Obesity in pets is more commonly due to over-eating (excessive caloric consumption) than disease. The most common cause of obesity is a chronic consumption of calories greater than actual daily energy requirement. Excessive dietary calories are stored as body fat.

Other causes of obesity are due to an altered energy metabolism. Some diseases and conditions can contribute to obesity. The most common is diabetes.

  • Diabetes mellitus – There is a relationship between obesity and diabetes, where overweight and obese animals become insulin resistant. These animals often begin to show the early signs of diabetes mellitus which are excessive drinking, excessive urinating and hunger. As the disease progresses, the cat eventually loses too much weight.


    Call your veterinarian if you suspect that your cat is overweight, or if your pet begins experiencing difficulty breathing or exercising or appears unable to get comfortable. Also, have a veterinarian examine your pet to determine if these abnormalities are present before instituting a weight loss program.

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