How to Tell if Your Dog Is Overweight (and What to Do)

Extra weight creeps up slowly. A few treats here, a slightly bigger scoop there, and one day your dog looks a bit rounder. Because a thick coat hides shape, and because a lot of dogs around us are overweight, it’s easy to stop noticing.

But extra weight isn’t harmless. It puts strain on joints, the heart and the breathing, and it can shorten a dog’s life. The good news is that it’s one of the most fixable health problems, and you can check at home in a couple of minutes. This guide shows how to check your dog, why weight matters, and how to help your dog slim down safely.

The short answer

You can’t judge a dog’s weight by the number on the scale alone, because healthy weights vary by breed and build. Instead, use three hands-on checks: ribs, waist and belly. If you can’t easily feel the ribs, there’s no visible waist, and the belly hangs low, your dog is likely carrying extra weight. Ask your vet to confirm, and to set a target weight and a safe plan.

How to check your dog at home

Do this with your dog standing, ideally in good light. Use your hands, since fur can fool your eyes.

1. The rib check.
Place your hands flat on your dog’s sides. You should be able to feel the ribs easily under a thin layer of fat, similar to feeling the back of your hand. If you have to press hard to find them, your dog may be overweight. If the ribs are sharp and prominent, your dog may be underweight.

2. The waist check (from above).
Look down at your dog from above. You should see a slight narrowing behind the ribs, an hourglass shape. If the body looks like a straight tube or bulges outward, there may be extra weight.

3. The belly check (from the side).
Look at your dog from the side. The belly should tuck up from the chest toward the back legs. A belly that sags or is level with the chest suggests extra weight.

4. Other signs.
Fat over the back and base of the tail, a rounded face, tiring quickly on walks, panting more than usual, or reluctance to jump or climb stairs can all be signs.

Body condition score

Vets often use a body condition score (BCS), usually on a 9-point scale, where about 4 to 5 out of 9 is ideal. A simplified version:

Score	What you’ll see and feel
1-3 (underweight)	Ribs, spine and hip bones easily visible, little to no fat cover
4-5 (ideal)	Ribs easily felt, clear waist, belly tucked up
6-7 (overweight)	Ribs hard to feel, waist barely visible, some fat over back and tail base
8-9 (obese)	Ribs can’t be felt, no waist, belly sags, fat deposits over the back and neck

Your vet can give your dog an accurate score and tell you what to aim for. Several veterinary organisations publish body condition charts you can compare against.

What about the scale?

The scale helps you track change, but breed standards and build vary a lot. A 10 kg dog might be perfectly healthy or 30% overweight depending on frame. Use the scale for trends, and the hands-on checks for the current picture. Weigh your dog at the vet, or at home by weighing yourself holding your dog and subtracting your own weight (for a small dog), or with a pet scale.

Fluffy and small dogs

• Fluffy and double-coated dogs can hide extra weight under their coat, so always feel the ribs and waist. See our guide to the best fluffy dog breeds.
• Small dogs have little room for error. An extra handful of kibble or a few treats can be a big percentage of their day, and a pound or two is a big proportion of body weight. See our guide to the best food for small dogs.

Why extra weight matters

Overweight dogs are at greater risk of:

• Joint problems and arthritis, since extra weight loads the joints
• Diabetes
• Heart and breathing problems, including trouble with heat and exercise
• Reduced mobility and tiring easily
• Some cancers and skin problems
• Higher risks with anaesthesia and surgery
• A shorter lifespan. Studies have linked lean body condition with longer lives in dogs, though individual results vary.

The reverse is also encouraging. Many dogs become more playful and mobile when they reach a healthy weight.

Why dogs gain weight

• Too much food or too many treats. The most common cause. Small amounts add up.
• Not enough exercise.
• Neutering, which can lower calorie needs, so portions may need adjusting.
• Age. Older dogs often burn fewer calories.
• Breed. Some breeds, such as Labradors, tend to gain weight easily.
• Table scraps and “human food.”
• Feeding by scoop or by eye, instead of weighing.
• Medical causes, such as an underactive thyroid (hypothyroidism), Cushing’s disease or certain medications.

If your dog gains weight without an obvious reason, or is hungry all the time, ask your vet to check for a medical cause before changing the diet.

How to help your dog lose weight safely

1. Start with your vet.
Have your vet confirm your dog’s weight, check for health problems, and set a target weight and a safe rate of loss. Losing weight too quickly can be harmful. Your vet can give you a daily calorie target.

2. Measure the food.
Weigh food on a kitchen scale instead of using cups or scoops, which can vary a lot. Follow the calorie target your vet sets, and start from the feeding guide on the package. Our guide to the real cost of feeding a dog shows how to turn a feeding amount into a daily number.

3. Count the treats.
Treats and extras should usually be around 10% of daily calories or less, and they should come out of the daily total, not on top of it. Swap high-calorie treats for low-calorie options, such as a few pieces of the dog’s own kibble, or small pieces of plain vegetables like carrot or green beans (check with your vet that they suit your dog). Remember that some foods are dangerous. See our guide to foods toxic to dogs.

4. Look at the food itself.
Check the calories per cup or per kg on the label. “Light” and “weight management” aren’t tightly defined terms, so compare actual calories. Some foods are formulated to help dogs feel full while eating fewer calories. Your vet may recommend one, or a prescription weight-loss diet. Our guide to reading a pet food label shows what to check, and you can browse our pages on dry food and fresh food.

5. Don’t cut food drastically on your own.
Slashing portions can leave your dog without enough nutrients and can backfire. A vet-set plan is safer, and your dog still needs a complete and balanced diet.

6. Increase activity gradually.
Add a little more walking, play or swimming, building up slowly, especially for dogs with joint problems or breathing difficulties. Ask your vet what’s suitable. Overweight dogs overheat more easily, so avoid hot weather and watch for heavy panting.

7. Make food last longer.
Slow feeders, puzzle toys and scatter feeding make a smaller meal more satisfying.

8. Get everyone on board.
One person feeding extras can undo everyone else’s work. Agree on the plan with the whole household, including children and visitors.

9. Weigh regularly and adjust.
Weigh your dog every few weeks and keep a record. Your vet may adjust the plan if progress stalls or goes too fast.

Begging and “but he’s always hungry”

Many dogs beg because it works, not because they’re starving. Try:

• Feeding in a quiet spot, and ignoring begging at the table
• Using part of the daily kibble as training rewards
• Offering a vet-approved low-calorie filler, such as plain green beans, if your vet agrees
• Giving attention, play and walks instead of food
• Asking your vet to rule out medical causes if hunger seems extreme

Mistakes to avoid

• Judging weight by looks alone. Feel the ribs.
• Using cups and scoops instead of weighing food.
• Forgetting treats, chews and scraps.
• Crash dieting your dog.
• Exercising an overweight dog too hard, too fast.
• Assuming it’s “just the breed” or normal ageing.
• Comparing with other overweight dogs.
• Ignoring sudden weight changes, in either direction.

When to call your vet

Contact your vet if:

• Your dog is overweight or obese by the checks above
• Your dog gained or lost weight quickly without a change in diet
• Your dog is drinking, urinating or panting more than usual
• Your dog is tired, stiff or reluctant to exercise
• Your dog has a swollen belly or seems uncomfortable (this can also signal a health problem unrelated to fat)
• Your dog is losing weight despite eating normally

Final thoughts

Keeping your dog lean is one of the most useful things you can do for their long-term health. Check their body shape regularly, weigh food, count treats, and ask your vet for a plan if your dog is carrying extra. Progress is gradual, and a few months of consistent effort can make a big difference. For help choosing a complete and balanced food, see how our reviews work.

Frequently asked questions