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Written by leading veterinarians to provide you with the information you need to care for your pets.

The Daily Vet by petMD

The Daily Vet is a blog featuring veterinarians from all walks of life. Every week they will tackle entertaining, interesting, and sometimes difficult topics in the world of animal medicine – all in the hopes that their unique insights and personal experiences will help you to understand your pets.

For today’s Daily Vet, we’re revisiting Dr. Ken Tudor’s column from March on the topic of 'fat but happy' cats. Does your cat need to lose weight? Before you put your cat on a diet, read what Dr. Tudor has to say.


Feeding the overweight cat is both the easiest and the most complex task. With few exceptions — like the emaciated looking Siamese at the small end and the Maine Coon at the large end — the ideal target weight for most cats is approximately ten pounds.


Unlike with dogs, we know the exact size of the thin cat inside Garfield and how many calories he needs. But administering that feeding program is nearly impossible. Cat eating behavior makes scheduled feedings very difficult, especially for working owners, and the unique carnivorous feline metabolism can put a dieting cat at risk for potentially fatal liver problems. The multi-cat household adds even more challenge and frustration.


The Easy Part: How Many Calories to Feed the Overweight Cat


No matter which of the many calculations we use to determine how much to feed the dieting cat, they all yield virtually the same number of calories: 200-225 calories, or kcal. This starting number can be reduced to as low as 150 if necessary. Remember to consult your vet before restricting your cat’s calories.


Cats Eat Small Amounts Frequently


If only these creatures ate like dogs and we could schedule their feedings and monitor their food intake. But they don’t. Cats are more content eating small meals, 6-8 times a day, at about 30 calories at a time. Ancestral meals were around the same size; a mouse contains just about 30 calories!


Modern cats eat like their ancestors, but without the hunt. Few owners have time to supervise 6-8 meals a day, and imposing 2-3 scheduled feedings is likely to result in inadequate food intake. As all cat owners know, offering a cat dry, crusted canned food from the last feeding will result in litter burying behavior rather than eating behavior. And few cats will eat 1/4 to 1/3 cup of dry food at one time.


Carnivores Ask More from the Liver to Metabolize Food


As obligatory carnivores, cat metabolism required unique evolutionary development. The cat liver processes the protein found in meals into energy, glucose (body sugar), and the amino acids and proteins their bodies require. This processing requires a store of fat from the meal, or from other body fat. The normal cat liver contains very high levels of working fat.


Cats will decrease their food intake because of the stress created by boarding, new pet sitters, moving to a new location, the turmoil of special family events or construction, and most importantly, changes in feeding practices and food quantities; i.e., changes to the diet, especially for weight loss. Decreased food intake results in fat recruitment to the liver to process the amino acids recruited from muscles. The liver becomes even more fatty than normal.


As this vicious cycle continues, a fatty liver, or hepatic lipidosis can occur. Without timely treatment, this condition is often fatal. Again, consult your vet before putting your cat on a weight loss diet.


The Multi-Cat Household Gambit


The feeding routine in multi-cat households can be daunting. The complex social structure, with its sometimes invisible dominance/subordinate interactions, dictates the feeding routine. Changing the routine to limit the food intake of the overweight pet can put pressure on this setting. Feeding the overweight cat separately often means isolating it or remodeling the living arrangement to allow only some of the cats access to certain areas (doors with electronic or magnetic responders). These solutions often influence the delicate social structure and cause disputes and other disruptive behavior. Generally, two to three scheduled feedings of canned food go well, but regulating the other dry food meals, especially in the owner’s absence, is difficult.


Multiple food stations or food puzzles are one solution. Two to three more feeding stations than the number of cats, each containing 25-30 calories, work for many households. For other households, the results are dismal and can result in decreased food consumption for all cats, putting all of them at risk of hepatic lipidosis.


I Sound Like Danny Downer


This was not meant to discourage, but only to highlight some of the realities facing those who are seeking weight loss solutions for their overweight cats, and to illustrate why so many cats stay fat and happy … and eventually diabetic. My own thirty pound diabetic tabby is testimony to these realities.



Dr. Ken Tudor



Image: BrAt82 / via Shutterstock

Comments  2

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  • Happy Fat Cat
    08/22/2012 07:29am

    My happy fat cat eats a few bites at each sitting then contentedly walks away. She doesn't even eat as much at one sitting as the trim kitties.

    She doesn't appear to eat more frequently, but no doubt she grazes during the day.

    We're slowly trying different things to slim her down.

  • fat happy cat
    08/22/2012 08:54am

    My fat cat, while not obese, is certainly a chunky monkey. The one thing I notice about her feeding habit is that she eats SO fast..almost like a Labrador! I finally figured out to either put her food in one of those flying saucer interactive cat toys and let her bat it around to get food or use a very small dish that her head doesn't fit into. Both slow her down. I give her a lot of very small meals during the day, both wet and dry. She has lost a bit of weight since I've been doing this but she is a "cobby" body type so will probably never be considered thin.

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