Is Your Dog Overweight? How to Use a Body Condition Score

A bathroom scale tells you what your dog weighs, but not whether that weight is right. A 60-pound dog can be lean or heavy depending on breed and frame. That is why veterinarians use a body condition score, a hands-on check of fat cover that works for any size of dog.

The World Small Animal Veterinary Association (WSAVA) publishes a widely used body condition chart on a 9-point scale. You can learn to do a version of the same check at home, then use it to start a better conversation with your vet.

1. The 9-point scale at a glance

WSAVA's dog chart groups the scores into three bands:

The descriptions focus on three things you can see and feel: the ribs, the waist viewed from above, and the abdominal tuck viewed from the side.

2. What each score looks like

Paraphrasing WSAVA's chart:

Under ideal

• 1: Ribs, lumbar vertebrae, pelvic bones, and all bony prominences evident from a distance. No discernible body fat. Obvious loss of muscle mass.
• 2: Ribs, lumbar vertebrae, and pelvic bones easily visible. No palpable fat. Some other bony prominences evident. Minimal loss of muscle.
• 3: Ribs easily felt and may be visible with no palpable fat. Tops of lumbar vertebrae visible, pelvic bones becoming prominent. Obvious waist and abdominal tuck.

Ideal

• 4: Ribs easily felt, with minimal fat covering. Waist easily noted from above. Abdominal tuck evident.
• 5: Ribs felt without excess fat covering. Waist observed behind the ribs from above. Abdomen tucked up when viewed from the side.

Over ideal

• 6: Ribs felt with slight excess fat. Waist discernible from above but not prominent. Abdominal tuck apparent.
• 7: Ribs felt only with difficulty under heavy fat. Noticeable fat over the lower back and base of the tail. Waist absent or barely visible. Tuck may be present.
• 8: Ribs cannot be felt under very heavy fat, or only with significant pressure. Heavy fat over the lower back and tail base. No waist, no tuck. Obvious abdominal distention may be present.
• 9: Massive fat over the chest, spine, and base of the tail. No waist or tuck. Fat deposits on the neck and limbs. Obvious abdominal distention.

3. How to check your dog at home

Turn the chart into three quick steps. Do them with your dog standing.

1. Rib check. Run your flat hands along both sides of the chest. At an ideal score, the chart says ribs are easily felt with minimal or no excess fat. If you have to press to find them, that points toward 7 or above. If they are visible from across the room, that points toward 3 or below.
2. Waist check. Look down from directly above. An ideal dog has a visible waist behind the ribs. A straight line or an outward bulge from ribs to hips points to the over-ideal range.
3. Tuck check. Look from the side. At ideal, the belly tucks up behind the ribs. A belly that hangs level with the chest, or lower, matches scores 8 and 9.

Long or thick coats can hide a lot, so the rib check by touch matters more than how the dog looks. Write down the score you think fits and the date, then repeat the check once a month. A trend is more useful than a single reading.

4. Why it is worth tracking

One of the studies listed on WSAVA's chart gives a sense of the stakes. Kealy and colleagues, writing in the Journal of the American Veterinary Medical Association in 2002, followed 48 Labrador Retrievers in pairs from 8 weeks of age until death. One dog in each pair was fed 25% less than its partner.

According to the study abstract, the food-restricted dogs weighed less, had lower body fat, and had lower serum triglyceride, insulin, and glucose concentrations. Their median life span was significantly longer, and the onset of signs of chronic disease was generally delayed. The authors concluded that a 25% restriction in food intake increased median life span and delayed signs of chronic disease in these dogs.

That was a controlled study in one breed, not a feeding plan to copy at home. Its lesson for owners is narrower: staying lean over a lifetime was linked with real health differences, so it is worth noticing gradual weight gain early.

5. What to do with your score

• Score 4 or 5: keep doing what you are doing, and keep checking monthly.
• Score 6: a good time to ask your vet about portion size and treats at the next visit.
• Score 7 or higher, or 3 or lower: schedule a visit. Weight changes in either direction can have medical causes, and your veterinarian can confirm the score, check for problems, and set a safe target and rate of change.

Do not cut your dog's food sharply on your own. Ask your veterinarian how much to feed, since needs depend on the individual dog, its food, and its activity level.

6. A note on cats

The descriptions above come from WSAVA's chart for dogs. Do not apply them to a cat. Instead, ask your veterinarian to score your cat at its next checkup and show you what to feel for, so you can track it at home the same way.

7. Key takeaways

• A body condition score rates fat cover on a 9-point scale; WSAVA's dog chart calls 4 and 5 ideal.
• At ideal, ribs are easily felt with minimal fat, a waist is visible from above, and the belly tucks up from the side.
• Feel the ribs rather than relying on looks, especially with thick coats, and track the score monthly.
• In a lifelong study of 48 Labradors, dogs fed 25% less had a significantly longer median life span.
• Talk to your veterinarian before changing how much your dog eats, especially at scores of 7 and up or 3 and below.