Is my dog overweight?

Why the scale alone can’t tell you

Two dogs of the same breed and weight can look very different: one tall and lean, the other short and round. That is why vets judge fat by touch and shape, using a body condition score, rather than by a number on the scale. It is also easy to miss at home. In the 2022 survey by the Association for Pet Obesity Prevention, vets classed 59% of dogs as overweight or obese, and 36% of the owners of those dogs described them as a normal weight.

Check your dog in three steps

1. Ribs. Stand behind your dog and run your flat hands along both sides of the chest. At an ideal weight you can feel each rib under a thin layer of fat without pressing.
2. From above. Look down at your dog standing still. You should see a waist: the body narrows behind the ribs before the hips.
3. From the side. Crouch to your dog’s level. The belly should tuck up behind the ribcage rather than run straight back or hang down.
4. Then feel the lower back and the base of the tail. Pads of fat there are a sign of a score of 7 or higher.

A thick or long coat can hide all of this from your eyes, so trust your hands. If your dog wriggles, try after a walk, when it is calmer.

The same AAHA table links each point to about 5% more body fat, from 20–24% at a score of 5 to 40–45% or more at 9. The guidelines also note that the scale becomes less precise in very obese dogs, above about 45% body fat.

From score to target weight

Because each point above 5 is about 10% extra weight, you can estimate an ideal weight by hand: divide today’s weight by 1 plus 0.1 for every point above 5. A 66 lb dog scored 7 is about 20% over, so 66 ÷ 1.2 gives an ideal weight of about 55 lb. A dog scored 6 at 44 lb works out to 44 ÷ 1.1, or about 40 lb.

Treat that number as a starting estimate for a conversation with your vet, not as a goal to hit fast. When you enter a body condition above 5 in the dog food calculator, it uses the same estimate and gives a daily calorie range for the ideal weight rather than the current one. The calorie guide shows that math step by step.

Muscle is a separate score

Fat and muscle aren’t the same thing, and a dog can be overweight while still losing muscle, often with age or illness. WSAVA publishes a separate muscle condition chart: the vet feels the spine, shoulder blades, skull and hip bones and grades any muscle loss from mild to severe. The 2021 AAHA guidelines ask vets to record weight, body condition and muscle condition separately at every visit.

Why a few extra pounds matter

The clearest evidence comes from a lifetime study of 48 Labrador Retrievers. Half of the dogs were fed 25% less than the other half (Kealy et al. 2002). In the follow-up report, the leaner group averaged a body condition score of 4.6 between the ages of 6 and 12, against 6.7 in the other group, and lived a median of 13.0 years against 11.2 (Lawler et al. 2008).

A much larger study of 50,787 dogs from 12 breeds in Banfield clinic records found the same direction in every breed: dogs recorded as overweight through middle age had shorter median lives (Salt et al. 2019). The gap ranged from about 5 months in male German Shepherds to 2.5 years in male Yorkshire Terriers. The 2021 AAHA guidelines list osteoarthritis and hormonal diseases such as diabetes among the conditions that come with obesity.

What to do next

• Write down today’s weight and score, then weigh your dog on the same scale and score again regularly.
• Measure meals rather than guessing, and count treats as part of the day’s food.
• Get a starting calorie range for the estimated ideal weight from the dog food calculator.
• Let your vet set the pace of any weight loss; it depends on your dog’s starting score and health.