“How much should my dog weigh?” is the wrong question, asked by almost everybody. Breed weight ranges are wide, crossbreeds sit outside them entirely, and two Labradors of identical height can healthily differ by six kilos. The question vets actually ask is what shape is this dog in — and that is measured with your hands, not a set of scales.

Around half of UK dogs are now overweight or obese, and the great majority of their owners believe their dog is a normal weight. This guide explains the body condition score, gives realistic breed weight ranges, and sets out how to reverse the problem without leaving your dog hungry.

How much should my dog weigh?

A healthy adult dog's ideal weight is the weight at which it scores 4 or 5 out of 9 on the body condition scale — ribs easily felt under a thin fat covering, a visible waist from above, and an upward tuck of the belly from the side. For most dogs that number falls somewhere inside the breed standard range, but the range is the map, not the destination.

The scales still matter, but as a tracking tool rather than a target. Weigh monthly, write it down, and treat a 5 per cent change either way as something to investigate.

Why the scales on their own lie

Three things make raw weight a poor guide on its own.

Breed ranges are enormous. The Kennel Club standard for a Labrador allows roughly 25–36 kg. A working-strain Labrador bitch at 25 kg and a show-strain dog at 36 kg can both be perfectly conditioned. Using the midpoint as a target would make one obese and starve the other.

Most UK dogs are crossbreeds. A Cockapoo has no standard at all. Neither does a rescue collie cross of unknown parentage — and those are exactly the dogs whose owners search hardest for a number.

Frame size varies within a breed. Height at the withers, bone thickness and chest depth differ substantially between individuals. Weight without frame is like knowing someone's weight but not their height.

Body condition scoring solves all three at once, because it measures fat cover relative to that dog's skeleton.

The 9-point body condition score, explained

The nine-point scale is the standard used in UK practice and recommended in the WSAVA global nutrition guidelines. Five is ideal; each point above five represents roughly 10 to 15 per cent excess body weight.

Some UK practices use a 5-point version. Score 3 out of 5 is the equivalent of 5 out of 9. The nine-point scale is more useful because it lets you record progress a half-point at a time.

The three-check hand test

This takes thirty seconds and is the single most useful thing an owner can learn. Do it with the dog standing, not sitting or lying.

1. The rib check. Run the flats of your fingers along the side of the chest, using the pressure you would use to feel the knuckles on the back of your own hand. You should feel each rib under a thin covering. If you have to push, there is too much fat. If they feel like the bones on the front of your knuckles — sharp, with nothing over them — the dog is too thin.

2. The waist check. Stand over the dog and look down. There should be a clear inward curve behind the ribcage, narrowing before the hips. An oval or a straight-sided outline means excess weight.

3. The tuck check. Look from the side, level with the dog. The underline should slope upwards from the back of the ribcage to the groin. A horizontal or sagging underline is a fat pad.

Ideal weight by breed: UK reference

Use these as the sanity check on your body condition score, not as targets in themselves. Bitches usually sit in the lower half of each range and dogs in the upper half.

For a crossbreed with no standard, take the midpoint of the two parent breeds as a starting estimate — then ignore it in favour of the hand test. If you are unsure what your dog is, the breed identifier can narrow the likely mix.

Puppy growth: what weight to expect

Puppies gain fast and unevenly, and an owner's instinct that a puppy “looks thin” is usually wrong. A growing puppy should be lean. The rough proportions below hold for most breeds.

A widely used shortcut for medium and large breeds: weight at 14 weeks, doubled, plus half again lands close to adult weight. It is a rule of thumb, not a prediction — parental size is a far better guide.

Keeping large-breed puppies lean matters more than in any other group. Rapid growth and excess weight during the first year are linked to hip and elbow dysplasia and to osteochondrosis. If in doubt with a large-breed puppy, err on the lean side and have your vet check at each vaccination.

Muscle, senior dogs and working dogs

Body condition scores fat. It does not score muscle, and the two come apart in older dogs.

A twelve-year-old Labrador can score 6 for fat while having lost a third of the muscle over its hindquarters — a pattern called sarcopenia. The dog looks “about right” on the scales because fat has replaced muscle kilo for kilo. Run your hands over the thigh, the shoulder and either side of the spine: hollowing over the top of the pelvis or a spine that feels increasingly prominent while the belly stays round is muscle loss, and it needs a veterinary conversation about protein intake, pain and mobility rather than a diet.

Working dogs go the other way. A sheepdog in the middle of the season or a gundog through the shooting season should sit at BCS 4, not 5, and will need substantially more calories — sometimes two or three times maintenance — to hold it.

What excess weight actually costs a dog

Overweight dogs live measurably shorter lives. The landmark lifetime study of Labradors found that dogs kept lean lived around two years longer than their moderately overweight littermates, and developed signs of osteoarthritis considerably later.

There is a financial dimension too. Weight-related conditions are among the largest categories of UK pet insurance claims, and a dog that develops a chronic condition faces steeply rising renewal premiums for the rest of its life. Keeping a dog lean is the cheapest preventive health measure available to an owner — it costs less than feeding them heavy.

How to take the weight off safely

1. Get a starting weight at the vet. Most UK practices have free nurse weight clinics and a walk-on scale in reception. Home bathroom scales work for small dogs: weigh yourself, then yourself holding the dog.
2. Set a target using body condition, not the breed table. Each point above 5 is roughly 10 per cent excess. A 34 kg Labrador at BCS 7 is about 20 per cent over, so the target is around 28 kg.
3. Feed to the resting energy requirement of the target weight. Not a percentage cut from current intake. The calorie calculator does this.
4. Weigh the food on kitchen scales. Every meal, every person in the house, same scale.
5. Take treats out of the daily total. Cut the dog's own kibble ration aside in a pot each morning and use it as training reward; nothing else comes out of the cupboard.
6. Add movement gradually. Two extra short walks beat one long one, and an arthritic or flat-faced dog may need swimming or hydrotherapy instead.
7. Re-weigh every two weeks. Target 1–2 per cent of body weight per week. If nothing moves in a month, cut a further 10 per cent or ask for a thyroid test.

When weight change is a medical sign

Book a veterinary appointment rather than adjusting food if you see any of the following:

• Weight loss despite a normal or increased appetite — possible diabetes, exocrine pancreatic insufficiency, malabsorption, or in older dogs, cancer.
• Weight gain despite careful feeding, plus lethargy, hair loss or a dull coat — classic hypothyroidism, common in Labradors, Golden Retrievers, Dobermans and Cockers.
• A pot belly with thin limbs, heavy drinking and a ravenous appetite — suggests Cushing's disease.
• A swollen abdomen with no fat elsewhere — fluid, not fat; needs same-day attention.
• Any loss of more than 10 per cent of body weight that you did not plan.

Frequently asked questions