Dog body condition score 1–9: how to check your dog

The 1–9 scale in plain words

WSAVA and AAHA both use a 9-point scale. WSAVA’s nutritional assessment guidelines set the goal for most pets at 4 to 5 out of 9, and note that this may look too thin to some owners. Scores below 4 are under ideal and scores above 5 are over ideal. Here is the scale in our own words; WSAVA’s illustrated chart for dogs is linked in the sources.

1. Ribs, spine and hip bones stand out from a distance; no fat can be felt; obvious loss of muscle.
2. Ribs, spine and hip bones are easy to see; no fat can be felt; some muscle loss.
3. Ribs are easy to feel and may be seen; no fat over them; waist and belly tuck are very obvious.
4. Ribs are easy to feel under a thin layer of fat; waist is easy to see from above; belly tucks up.
5. Ribs can be felt without extra fat over them; waist is visible behind the ribs; belly tucks up from the side.
6. Ribs can be felt under a slight extra layer of fat; waist is visible from above but not prominent.
7. Ribs are hard to feel under a noticeable layer of fat; little or no waist; fat over the lower back and tail base.
8. Ribs cannot be felt without firm pressure; no waist; heavy fat over the back and tail base; belly may sag.
9. Large fat deposits over the chest, back, tail base and neck; no waist; the belly clearly sags.

How to check your dog at home

1. Feel the ribs. With your dog standing, run your flat hands along both sides of the chest. Ask yourself how much pressure it takes to feel each rib, not whether you can see them.
2. Look from above. Standing over your dog, look for an inward curve — a waist — behind the ribs.
3. Look from the side. At eye level with your dog, check whether the belly line rises from the chest toward the hind legs (the tuck) or runs level or sags.
4. Feel the lower back and the base of the tail for fat pads.
5. Match what you found to the descriptions above and pick the closest number. If you are between two, note both.

Long or thick coats hide a lot. WSAVA’s guidelines say palpation — feeling with your hands — is required to score accurately, especially in dogs with medium to long coats. A photo or a glance is not enough.

Why owners tend to score too low

Scoring your own dog is harder than it sounds. In a study of 110 dog owners, most misjudged their dog’s body condition whether or not they were given a body condition chart: 64% were wrong with the chart and 65% without it. When owners were wrong, they almost always underestimated — about 9 in 10 of the wrong scores, with or without the chart, were lower than the researcher’s.

So if your home check lands at 5 and your dog has been gaining weight, treat the 5 with some suspicion. Ask your vet to score your dog at the next visit and write the number down next to the weight; checking both every few weeks is how you see a trend.

From a score to an ideal-weight estimate

AAHA’s 2021 guidelines give the rule of thumb for turning a score into weight: each body condition point above 5 is roughly 10% overweight, and each point adds about 5 percentage points of body fat. Merck uses the same yardstick in percentage terms: dogs 10–20% above ideal body weight are overweight, and more than 20% above is obese.

There are two ways to turn that into an ideal weight, and they drift apart at high scores:

• Divisive: ideal = current weight ÷ (1 + 0.1 × points above 5). This matches AAHA’s reading of each point as 10% above the ideal weight, and it is what our calculator uses.
• Subtractive: ideal = current weight × (1 − 0.1 × points above 5). This is the form in a worked example in AAHA’s 2014 weight guidelines and in a 2009 study model.

For a 30-kg (66-lb) dog:

At 9 of 9 the two methods differ by 16%. Read the subtractive way, a score of 9 would mean being 67% overweight instead of AAHA’s 40%, which is why we use the divisive form as the point estimate.

The range column comes from real dogs. In a study of 28 obese pet dogs that completed weight loss, the median weight lost per body condition point was 10% of the starting weight, but it ranged from 5% to 15%, and the authors warned that the estimate can over- or under-shoot the right end point. AAHA’s 2014 guidelines add that the ideal weight should be re-estimated as the dog slims down and its score improves. So treat any ideal weight — ours included — as a first target your vet refines.

A score of 7 of 9 on a 30-kg dog doesn’t mean the dog is ill. It means the body condition is above the ideal range of 4–5, and your vet can confirm it and help plan the next step.

Is there a BMI for dogs?

Not in the veterinary guidelines we read: none of them uses a weight-for-height index. They use the body condition score, which looks at the dog’s own fat cover instead of comparing it with other dogs, and which has been checked against body scans. In a study of 23 pet dogs, body fat estimated from the score agreed closely with dual-energy X-ray absorptiometry (DEXA), the reference scan (r² = 0.92).

The score has limits. WSAVA notes that the ideal range rests on a limited number of studies, and that no validated scale goes beyond 9, even though some very obese pets are heavier than a 9 describes. AAHA adds that the score is less reliable for animals with very high body fat, above about 45%.

Muscle is a separate score

Body fat and muscle are scored separately. AAHA states that body condition and muscle condition are not causally related and should be assessed on their own, so a dog can carry too much fat and still have lost muscle. WSAVA describes checking muscle by feeling over the head, shoulder blades, spine and hips, and notes that muscle loss is greater in pets with illness than in those that are simply underfed. If your dog feels bony over the spine but soft around the belly, mention it to your vet.

Next step

Once you and your vet agree on a score, the pet weight-loss calculator turns it into an ideal-weight estimate with its range, daily calories at that weight and a weekly loss target. The plan itself is explained in safe weight loss for dogs.