The gap this page fills
Read the first page of results for this question and the shape is identical every time. APOP publishes the body condition scoring chart with a quick visual check and a hands-on check, describes each of the nine points, and stops at the description. VCA Animal Hospitals explains how to score a dog, why the score matters, and how it relates to the ribs, the waist and the abdominal tuck — and stops at the description. WSAVA publishes the nine-point chart itself; along with AAHA they are the bodies the chart comes from, so they publish the reference, not the arithmetic. AAHA has the canine body condition score as a printable chart. PetMD runs a demonstration of how to evaluate a dog using the nine-point system. Every one of them is good at what it does, and every one of them does the same thing at the end: it tells you the dog is a 7, and then it tells you to talk to your vet.
What all of them leave out is the conversion, and the conversion is the part that decides what happens on Monday morning. A score is a description of shape. It becomes actionable only when it is a quantity — and the quantity is not the same for a 25 lb dog and a 90 lb dog, which is precisely why a chart cannot give it to you. Across the pages we read for this question, not one printed a single pound figure, a single calorie figure, or a single number of months attached to a score.
That is the only thing this page does. It takes the score, applies the relationship between the nine-point scale and body fat that the references describe, and prints the weight the score implies, the calories that reach it, and the time it takes. The scale stays exactly as the references define it — this page just finishes the sentence they all stop halfway through.
Canine body condition score: the 9-point scale
The canine body condition score is a nine-point scale, and it is the scale the references agree on. Scores 1 to 3 describe an underweight dog, 4 and 5 describe ideal, and 6 to 9 describe excess. The scale is not a weight: two dogs of identical weight can sit at different scores because one carries muscle and the other carries fat, which is the entire reason the score exists alongside the number on the scale.
What the references also state, and what makes the conversion possible, is the relationship between a point on the scale and body fat. Moving one point on the nine-point scale corresponds to roughly ten per cent of body weight. That is the figure this page builds on: a 7 is two points above ideal, so roughly twenty per cent above the weight the dog should be. It is an estimate, and the references treat it as one, but it is an estimate that turns a description into a number — and a number you can act on beats a description you cannot.
Body condition score chart
The body condition score chart below is the conversion the printable charts leave out. Each cell gives the ideal weight the score implies and the pounds between there and here.
| Current weight | 6 / 9 | 7 / 9 | 8 / 9 | 9 / 9 |
|---|---|---|---|---|
| 30 lb | 27.3 lb / 2.7 to lose | 25.0 lb / 5.0 to lose | 23.1 lb / 6.9 to lose | 21.4 lb / 8.6 to lose |
| 50 lb | 45.5 lb / 4.5 to lose | 41.7 lb / 8.3 to lose | 38.5 lb / 11.5 to lose | 35.7 lb / 14.3 to lose |
| 70 lb | 63.6 lb / 6.4 to lose | 58.3 lb / 11.7 to lose | 53.8 lb / 16.2 to lose | 50.0 lb / 20.0 to lose |
| 90 lb | 81.8 lb / 8.2 to lose | 75.0 lb / 15.0 to lose | 69.2 lb / 20.8 to lose | 64.3 lb / 25.7 to lose |
Read across the 7/9 column and the shape of the problem changes with the dog: five pounds off a small dog is a quarter of its body, and fifteen pounds off a large one is a sixth. The chart is the same arithmetic for both, which is the point — it is the arithmetic the printable version never runs.
BCS dog: how to score your own dog
Running a BCS check on your own dog takes about a minute and no equipment. The references describe it in a fixed order, and the order matters because each step narrows the answer.
- Ribs. Run your palms along the ribcage with light pressure. Ideal is ribs you can feel immediately under a thin cover. A 6 is ribs you can feel but with a noticeable layer between your hand and the bone. A 7 is ribs you have to press for.
- Waist, seen from above. Look down at the dog standing. Ideal is a clear narrowing behind the ribs. At 7 the waist is discernible but not prominent; at 8 and above it is gone.
- Abdominal tuck, seen from the side. Ideal is a distinct upward slope from the ribcage to the hind legs. At 6 it is present but less defined; by 8 there is no tuck at all.
- Fat deposits over the base of the tail and the spine. These are where the excess accumulates last and shows first, and they are what separates an 8 from a 9.
Two cautions come straight from the references. Coat length changes what you can see but not what you can feel, so on a thick-coated dog trust your hands over your eyes. And a dog with a large amount of muscle can read higher than it is on the visual check alone, which is why the hands-on check exists alongside the picture.
Body score dog: why the number is not the weight
A body score for a dog is not a substitute for the scales and the scales are not a substitute for the score, and owners get told this without being told why. The reason is that they move on different timescales. Weight changes within days from water, from a missed meal, from a full bladder. The score changes over weeks and months because it tracks fat, not contents. A dog that drops two pounds in a week has not improved its score; a dog whose score has moved one point has changed by roughly ten per cent of its body composition.
That difference is why the timeframe on this page is given in months. Re-weighing weekly is the right way to track the plan, but re-scoring every week will show you nothing and convince you the plan has failed. Score once, work out the target from it, weigh weekly against the pounds, and re-score at the point the months say you should be there.
Dog BCS: how the calories are worked out
The calorie target is the part with the most arithmetic behind it, and it is worth knowing what it does, because it is not a flat cut.
Resting energy requirement is worked as seventy times body weight in kilograms to the power of three quarters — the standard formula the veterinary references use. For weight loss the multiplier applied to it is 1.0, and the weight it is applied to is the ideal weight, not the current one. That second part is the one that matters. Feeding a dog at 1.0 times the requirement for the weight it currently is will hold it roughly where it is, because you are feeding the fat as well as the dog. Feeding 1.0 times the requirement for the weight it should be is what moves it.
| Current weight | 6 / 9 | 7 / 9 | 8 / 9 | 9 / 9 |
|---|---|---|---|---|
| 30 lb | 462 kcal | 433 kcal | 407 kcal | 385 kcal |
| 50 lb | 677 kcal | 635 kcal | 598 kcal | 565 kcal |
| 70 lb | 872 kcal | 817 kcal | 769 kcal | 727 kcal |
| 90 lb | 1,053 kcal | 986 kcal | 929 kcal | 878 kcal |
The counter-intuitive part is that the target falls as the score rises. A 90 lb dog at 9/9 is fed 878 calories a day, less than the same dog at 6/9 is fed at 1,053. That is not an error: the ideal weight is lower, so the requirement of the ideal weight is lower, and feeding the lower figure is what gets the larger dog there. Cutting harder on a heavier dog than the formula says is the most common way these plans go wrong.
How many months the score takes to move
Safe weight loss in dogs runs at roughly half to one and a half per cent of body weight per week. This page gives the range across both ends, and the middle figure at one per cent.
| Score | Months at 0.5% / week | Months at 1% / week | Months at 1.5% / week |
|---|---|---|---|
| 6 / 9 | 4.4 | 2.2 | 1.5 |
| 7 / 9 | 8.4 | 4.2 | 2.8 |
| 8 / 9 | 12.1 | 6.0 | 4.0 |
| 9 / 9 | 15.5 | 7.7 | 5.2 |
The column worth staring at is that the months do not change with the dog's size. A 30 lb dog and a 90 lb dog both at 7/9 take the same four months, because both are losing the same proportion of themselves. What differs is the pounds: five versus fifteen. Owners of large dogs are often told their dog will take longer, and it is not true — the same proportion takes the same time, and the large dog simply has further to fall in absolute terms.
Questions people ask
Is a body condition score of 7 bad?
It is two points above ideal, which on this page is about twenty per cent above the weight the dog should be. It is common and it is reversible, but it is not a rounding error — on a 60 lb dog it is about ten pounds, and it is the range where joint and metabolic problems start to show up in the literature.
How fast should a dog lose weight?
Half to one and a half per cent of body weight per week is the range this page uses. Faster than that and you risk losing muscle rather than fat, which lowers the requirement further without improving the score — the reason crash diets produce dogs that rebound.
Why is the calorie target lower than what I feed now?
Because it is worked from the weight the dog should be, not the weight it is. The difference between the two figures in the result is the size of the cut, and it is usually larger than owners expect. If the cut looks impossibly large, the answer is to re-check the score — an over-scored dog produces an over-aggressive target.
Does this replace the weight loss calculator?
No, it feeds it. This page turns a score into a target weight and a calorie figure; the weight loss calculator takes a target weight and works the weekly plan from it. Use this page to find out where the dog should be, then that one to get there. If you already know the target weight, go straight to the calculator.
Can I use a 5-point scale instead?
The references this page follows use nine points. If your vet uses a five-point scale, the rough correspondence is that each point on the five-point scale is about twenty per cent, so a 4 out of 5 sits close to a 7 or 8 out of 9. Score on the nine-point scale here for the arithmetic to line up.
Sources
- Association for Pet Obesity Prevention. Dog Body Condition Scoring. The nine-point scale, the quick visual check and the hands-on check.
- WSAVA Global Nutrition Committee. Body Condition Score. The nine-point chart as published by the body that issues it.
- VCA Animal Hospitals. Body Condition Scoring in Dogs. How the ribs, waist and abdominal tuck are assessed.
- American Animal Hospital Association. Canine Body Condition Score. Nine-point scale with descriptors.
- PetMD. How to Find Your Dog's Body Condition Score. Demonstration of the nine-point evaluation.
- MSD Veterinary Manual. Nutritional Requirements of Small Animals. Resting energy requirement formula (RER = 70 × body weight0.75) and the multipliers by life stage.