The pet cat population in the United States exceeds the pet dog population, yet the average cat visits the veterinarian only
half as often as the average dog.1 Conversely, advancements in feline health care offer us more opportunities to maximize
cats' long lives. It's our job to make sure cats receive routine care.
Susan Little, DVM, DABVP
Diagnosing and treating chronic health conditions is one of the most rewarding areas of feline health care. By learning to
recognize and treat these conditions, you will deliver higher-quality medicine. The satisfaction of practicing good medicine
motivates both veterinarians and support staff members, and clients will feel more bonded to your practice. Here's a look
at the most common feline chronic illnesses and recent medical advances.
It has been estimated that 25% to 33% of cats are either overweight or grossly obese (Figure 1).2 Yet the 2003 AAHA Compliance Study3 found that veterinarians significantly underdiagnose feline obesity. Cat owners may not recognize obesity or know about
the associated health risks, which include diabetes mellitus, hepatic lipidosis, lameness, lower urinary tract disease, and
other health problems.
Figure1. Obesity is one of the most common feline diseases, affecting at least 25% of pet cats.
For many feline patients, managing obesity is a lifelong issue. Quantifying obesity is the first step to help both you and
the owner recognize the problem. Cats are considered overweight when they are 10% above optimal body weight and obese when
they are 20% above optimal weight. Weigh feline patients at every visit and record their body condition scores using a chart
such as the Purina 9-point Body Condition System. Optimal body weight is correlated with a score of 5 using the Purina system.
As we better understand cats' nutritional needs, we're better able to prevent and treat feline obesity. For example, we know
that carbohydrate-rich, energy-dense diets contribute to feline obesity. Energy-restricted diets may lead to weight loss—but
often at the expense of lean body mass. Many veterinarians and cat owners have been frustrated by the poor success rate of
traditional high-fiber, low-calorie weight loss diets.
On the other hand, cats receiving high-protein, low-carbohydrate diets can lose weight and maintain lean body mass. Some
commercial diets, such as Hill's Prescription Diet m/d, offer high-protein, low-carbohydrate formulations designed for weight
management. Research also supports the administration of carnitine at 250 to 500 mg/cat/day in addition to dietary therapy to enhance fat metabolism and weight loss.2,4 Carnitine supplementation
is continued for as long as needed to achieve and maintain optimal body weight.
A successful weight management plan starts with calculating the cat's daily food requirement using the manufacturer's feeding
guide based on the target body weight. If the cat doesn't lose weight within one month, reduce the daily portion by 10% to 15% until the cat starts losing weight. Schedule regular re-evaluations to monitor progress and encourage
owners to keep a diary of the diet type, amount fed, and body weight over time. Many obese cats will require up to 12 months
to reach their target weight safely, so remind owners that patience and commitment will increase their chances of success.