Dog and cat body condition score: how to check your pet's weight at home

"Is my dog overweight?" is hard to answer from the scale alone. A 10 kg dog can be lean and a 10 kg dog of a different build can be overweight, and a number on its own says nothing about how a pet looks and feels. Vets use something more useful: the body condition score (BCS), a simple scale that rates body fat from what you can see and feel. The World Small Animal Veterinary Association (WSAVA) publishes a widely used 9-point chart for dogs and cats. This guide explains how to use it at home, what the scores mean, and how to combine it with weight tracking. It is general information; only your veterinarian can tell you what is right for your pet.

What a body condition score is

The WSAVA charts give a score from 1 to 9 for dogs and, separately, for cats. A score of 1 means very thin, 9 means severely overweight, and the middle of the scale is where most healthy pets should sit. The chart looks at the same few features every time:

• Ribs: can you feel them, and how much covering is there over them?
• Waist: viewed from above, is there a narrowing behind the ribs?
• Abdominal tuck: viewed from the side, does the belly line rise from the chest towards the hind legs?
• Fat deposits: over the lower back and the base of the tail in dogs, and over the abdomen in cats.

Weight is not part of the score. That is the point: the score tells you about shape, which is what matters for the pet's health, and it still works for breeds and mixes where "normal weight" is hard to know.

How to check at home in two minutes

1. Look from above. Stand over your standing pet. In an ideal dog the chart describes a waist that you can see behind the ribs. In a cat at an ideal score the waist is visible behind the ribs too.
2. Look from the side. Is there a tuck, where the belly rises behind the ribcage? In dogs at the ideal scores of 4 and 5 the chart describes an evident abdominal tuck.
3. Feel the ribs. Run the flats of your fingers along the side of the chest, with light pressure. In the ideal range, the WSAVA chart describes ribs that can be felt easily, under little or no excess fat. At the higher end they are felt with difficulty or not at all.
4. Feel the spine and tail base. The chart notes noticeable fat over the lumbar area and tail base from a score of 7 in dogs, and from 8 in cats.
5. Compare to the chart and pick the closest score. If you are between two, choose the one that matches more of the features, or ask your vet.

Long or thick coats can fool the eye, so rely on your hands as much as your eyes. Do the check in the same way, in the same place, every month or so.

The dog scale, in plain language

The cat scale, in plain language

Note the difference between the species: on the WSAVA charts the ideal range for dogs is 4 and 5, while for cats it is 5, with 4 listed as under ideal. That is one reason to ask your vet to score your own cat rather than relying on the dog guide.

What to do with the result

Ideal (4-5 for dogs, 5 for cats)

Keep doing what you are doing, and keep checking. Pets can drift from one score to another over a season, for example after an injury, a change of routine or a stretch with less exercise. Ask your vet what is normal for your pet's age and breed.

Above ideal (6 and up)

Do not start a diet on your own. Book a visit and ask your vet to confirm the score, check for medical causes, and set a target and a feeding plan. For most pets that means measured meals, a look at treats and extras, and gradual change rather than a crash diet; the details, especially for cats, should come from your vet. A written plan with a target weight and a re-check date is much easier to follow than a vague intention to "feed a bit less".

Below ideal (3 and under)

A thin pet deserves a vet visit too, particularly if the change is recent, because weight loss can have medical causes. Mention appetite, thirst, vomiting and stools when you call.

Combine the score with weight tracking

The score and the scale answer different questions. The scale tells you whether something is changing; the score tells you whether the weight is the right weight for this body. Together they are a strong, simple routine:

1. Weigh your pet at a regular interval and write it down. Our pet weight tracking guide explains how to weigh a pet at home and how to read a trend.
2. Score the body condition on the same day, using the same chart.
3. Write both in one place, with the date, and add a photo from above and from the side. A photo taken every month or two shows changes that are easy to miss when you see the animal every day.
4. Bring the notes to the vet. Weight at each visit, the score, and your own observations give the vet a history instead of a single snapshot.

In Pawfolio you can log your pet's weight over time next to vaccinations, medicines and vet visits, and see the trend as a chart, which makes the conversation with the vet much quicker. See also what to keep in a pet health record.

Common mistakes

• Judging by eye only. Fur hides the body shape, especially on long-haired dogs and cats. Use your hands.
• Comparing to other pets. If every dog at the park is a little heavy, a normal one starts to look thin. Use the chart as your reference.
• Using a dog chart for a cat, or the reverse. The WSAVA publishes separate scales and their ideal ranges differ.
• Chasing a number from the internet. A breed average is a rough guide at best. The score and your vet's target for your individual pet are better.
• Cutting food sharply on your own. The amount, the food and the pace of weight loss are for your vet to set.

This guide and Pawfolio do not replace veterinary care. Your veterinarian can confirm your pet's body condition score and advise on any diet change.

Frequently asked questions

What is a body condition score for dogs and cats?

A 1 to 9 scale, published by WSAVA among others, that rates body fat from what you can see and feel: the ribs, the waist seen from above and the abdominal tuck seen from the side.

What is the ideal body condition score for a dog?

On the WSAVA 9-point chart, 4 and 5 are the ideal scores for dogs. Ribs are easily felt under little or no excess fat, with a visible waist and abdominal tuck.

What is the ideal body condition score for a cat?

On the WSAVA chart, 5 is the ideal score for cats: well proportioned, waist visible behind the ribs, ribs felt under slight fat and a minimal abdominal fat pad.

How do I check my dog's body condition at home?

Look from above for a waist, look from the side for a tuck, and feel the ribs with the flats of your fingers. Compare what you see with the chart and confirm the result with your vet.

Should I put my overweight pet on a diet myself?

No. Ask your vet to confirm the score, rule out medical causes and set a target weight and feeding plan.