It is easy to be wrong about your own dog’s weight. Dogs are rarely compared side by side, and many of the dogs we meet are heavier than they should be, so a heavy dog can look normal. A more reliable method is a three-part test that takes two minutes and needs nothing but your hands and your eyes. This guide walks through it, explains what the results mean and links to the tools that turn a suspicion into a plan.
Why the scale is not enough
A dog’s weight tells you how heavy it is, not whether that weight is right for its frame. Two dogs of 25 kg can be a lean working dog and a heavy, stocky one. For this reason vets use the body condition score, a 1-to-9 rating based on how the dog looks and feels, and then work out the ideal weight from it. If you want the full scale, see our body condition score chart. This page is a quick version: the three checks and what to do about the answer.
The three checks
Stand your dog on level ground in good light.
1. The rib test (feel). Run your hands along the sides of the chest. In a healthy dog you can feel each rib easily under a thin layer of padding, a bit like feeling the back of your hand with the fingers spread. If you have to press firmly, or you cannot find the ribs, there is extra fat. If the ribs are sharp and visible, the dog may be too thin.
2. The waist test (look from above). Stand over your dog and look down along its back. There should be a narrowing behind the ribs, an hourglass shape. If the body looks straight like a tube, or bulges outwards, the dog is probably overweight.
3. The tuck test (look from the side). From the side, the belly should rise from the chest towards the back legs. A flat line or a hanging belly suggests extra weight.
For a long-haired dog, rely on touch because the coat hides the shape.
What the results mean
| What you find | Likely meaning | Score range |
|---|---|---|
| Ribs easy to feel, clear waist, visible tuck | Healthy weight | 4 to 5 |
| Ribs felt with a little pressure, waist less clear | Slightly overweight | 6 |
| Ribs hard to feel, waist barely visible, fat at the tail base | Overweight | 7 |
| Ribs not felt, no waist, belly bulges | Obese | 8 to 9 |
| Ribs, spine and hips easy to see, little padding | Too thin | 1 to 3 |
If your dog is in the thin range, see your vet before changing food. If it is in the overweight range, the next step is to estimate how much excess there is.
How much too heavy?
The 9-point scale links score to excess weight. Each point above 5 is about 10% over ideal (Laflamme 1997). The Dog Overweight Percentage Calculator tells you how far over a known ideal weight your dog is, and the Dog Body Condition Score Calculator estimates the ideal weight from the score.
| Current weight | Score 6 | Score 7 | Score 8 | Score 9 |
|---|---|---|---|---|
| 10 kg | ideal about 9.1 kg | 8.3 kg | 7.7 kg | 7.1 kg |
| 20 kg | 18.2 kg | 16.7 kg | 15.4 kg | 14.3 kg |
| 30 kg | 27.3 kg | 25.0 kg | 23.1 kg | 21.4 kg |
For example, a dog that weighs 30 kg and scores 7 is about 20% over, and its ideal weight is about 25 kg. The numbers are estimates for your vet to confirm.
A worked example
You feel your 20 kg dog’s ribs and find you have to press. From above, the waist is hard to see, and from the side the belly is flat. You decide the score is 7.
- Score above 5: 2 points, so about 20% over.
- Ideal weight ≈ 20 ÷ 1.20 ≈ 16.7 kg.
- Excess ≈ 3.3 kg.
- At 1 to 2% a week, reaching 16.7 kg takes about 9 to 18 weeks.
- Next: book a vet visit to confirm the score and agree a plan.
Why it matters
Extra weight puts strain on joints and makes exercise harder. It is also linked with other health problems, which is why vets raise it even when the dog seems happy. The risk grows with the size of the excess, and the benefit of losing weight is real. The point of the test is not to judge your dog’s looks but to catch a problem early, when a small change in feeding will fix it.
What to do next
- Confirm with your vet. They can check the score and rule out medical causes of weight gain.
- Agree a goal weight. Use the estimate above as a starting point.
- Set a calorie target. Our guide to calories for dog weight loss explains the rule.
- Plan the pace. About 1 to 2% of body weight a week.
- Track. Weigh and score every month.
Our dog weight loss plan puts these steps together.
If your dog scores 6
A score of 6 is only slightly overweight and often can be fixed with small changes: weigh the food, cut treats, add a little more walking and recheck in a month. Do not wait, because it is easier to correct 10% than 30%. If you are not sure, ask your vet to show you the difference between a 5 and a 6 on your own dog.
Common reasons dogs gain weight
- Overfeeding by scoop instead of scale.
- Treats, chews and table scraps.
- Less exercise than before.
- Neutering, which lowers energy needs for many dogs.
- Age, as activity and muscle change.
- A feeding amount that was never adjusted when the dog stopped growing.
- Several people feeding the same dog.
Common mistakes
- Judging by the scale alone.
- Judging by looking at other dogs.
- Relying on sight only for a long-coated dog.
- Waiting until the problem is large.
- Starting a crash diet.
- Not involving the vet.
Rib test, in more detail
The rib test is the most important of the three. A few details make it more reliable:
- Use the flat of your fingers, not the tips, and light pressure.
- Run your hands along the side of the chest, behind the elbows, rather than over the shoulder.
- Compare with the back of your own hand: with fingers spread, you can feel the bones under thin skin. That is how healthy ribs should feel.
- Compare with the back of your fist: with a clenched fist, the knuckles are covered. That is how overweight ribs feel.
- Check both sides, since a dog can lie on one side and make the other seem thicker.
If you are unsure, ask your vet or a vet nurse to show you at the next visit. Learning the feel once is worth a lot.
Weight changes over a dog’s life
A dog’s weight tends to change in predictable ways, and the changes are easy to miss.
| Life event | What often happens |
|---|---|
| Neutering | Energy needs fall; weight can creep up if food is not adjusted |
| End of growth | Puppy food amounts are too much for an adult |
| Reduced exercise (injury, winter) | Weight rises if food stays the same |
| Ageing | Muscle declines; weight may rise or fall |
| More treats at a stage of life (retirement, children) | Calories rise unnoticed |
Each of these is a moment to re-score and re-weigh. If you do it at each event, a small change can be corrected before it becomes a large one.
What a plan looks like for a dog scoring 7
A dog of 20 kg scoring 7 is about 20% over, with an ideal weight near 16.7 kg. A sensible first month might be:
| Week | Action |
|---|---|
| 1 | Book a vet visit; weigh and photograph the dog; start measuring food by weight |
| 2 | Vet confirms score and goal; set a calorie target (see our calorie guide); cut treats to the allowance |
| 3 | First weigh-in; no changes unless something is clearly wrong |
| 4 | Second weigh-in; compare with 1 to 2% a week |
The aim of the first month is to establish the routine, not to change numbers quickly.
A two-minute home check
- Stand over your dog and look down: you should see a waist behind the ribs.
- Look from the side: the belly should tuck up toward the back legs.
- Run your hands along the ribs: you should feel them under a thin layer of fat without pressing hard.
- Check weight against the last vet reading.
- Score the dog on the 9-point scale in our body condition score chart, where about 4 to 5 is ideal.
If the ribs are hard to feel and the waist has gone, the dog is likely carrying extra weight. Each point above ideal is roughly 10% over ideal weight, so a dog at 7 of 9 might be about 30% above. Use the Dog Overweight Percentage Calculator and talk to your vet before starting any plan.
What to do if the answer is yes
Do not start a strict diet on your own. Book a vet visit to rule out medical causes, agree a goal weight and a pace of loss, and check the current food and treats. Our dog weight loss plan and the guide on how fast a dog should lose weight explain a typical safe pace of about 1 to 2% of body weight a week. Weigh every one to two weeks and keep notes.
Quick summary
- Check three things: ribs by feel, waist from above, belly tuck from the side.
- If ribs are hard to find and the waist is missing, your dog is likely overweight.
- Each point above 5 on the 9-point scale is about 10% over ideal; a 30 kg dog scoring 7 has an ideal weight near 25 kg.
- See your vet to confirm and agree a plan; aim for 1 to 2% a week.
- Recheck every month.
- Use the Dog Body Condition Score Calculator to estimate the ideal weight.
Frequently asked questions
How can I tell if my dog is overweight?
Feel the ribs, look from above for a waist and from the side for a belly tuck. If the ribs are hard to feel and the waist is missing, your dog is likely overweight.
How much overweight is my dog?
Use the 9-point body condition score: each point above 5 is roughly 10% over ideal. A dog scoring 7 is about 20% over.
Can I tell from the scale alone?
Not reliably. Breeds differ, so weight alone does not show whether a dog is lean or heavy; body condition is a better guide.
Is a little extra weight a problem?
Even a modest excess adds strain to joints and can affect health over time. Aim for a score of 4 to 5.
What should I do if my dog is overweight?
See your vet to agree a goal weight, then follow a measured plan with a weekly loss of about 1 to 2%.
How do I check a long-haired dog?
Use your hands. Run them along the ribs and over the waist, because fur hides the shape.
How often should I check?
Monthly. Small changes are easy to miss day to day.
Sources
- WSAVA Global Nutrition Guidelines (incl. 9-point BCS charts)
- Laflamme D. (1997) Development and validation of a body condition score system for dogs. Canine Practice
- AAHA (2014) Weight Management Guidelines for Dogs and Cats
Related calculators
- Dog Overweight Percentage CalculatorSee how far above its ideal weight your dog is, in percent and in kilograms.
- Dog Body Condition Score & Ideal Weight CalculatorScore your dog's body condition on the 9-point scale and estimate its ideal weight.
- Dog Weight Loss CalculatorPlan a safe weight-loss target: daily calories and how many weeks it should take.
Keep reading
- Dog Body Condition Score Chart (1 to 9)Use the 9-point dog body condition score chart: what each score looks and feels like, how to check ribs, waist and tummy, and how to estimate ideal weight.
- Dog Ideal Weight: How to Estimate ItHow to estimate your dog's ideal weight from body condition: the 10% per point rule, a table for 10 to 40 kg dogs, breed limits and how to confirm with a vet.
- Dog Weight Loss Plan: Calories and PaceA practical dog weight loss plan: how to set a goal weight, work out daily calories, choose a safe pace of 1 to 2% a week and track progress.
- How Overweight Is My Dog? Percent Over IdealHow to work out how overweight a dog is: percent over ideal = (current − ideal) ÷ ideal × 100, the 10% per condition point rule, examples and next steps.