Is my dog overweight? A 30-second UK self-check (and what to do next)

If you've found this page, you've already done the hardest bit. Most owners never ask the question. The PDSA's PAW Report puts UK pet obesity at numbers most of us would rather not look at: vets estimate around 46% of dogs are overweight or obese, and published research suggests the real figure is closer to 65%. Yet around four in five owners believe their dog is at an ideal weight. That gap — between what we see at the lead and what the scale would tell us — is the one this guide is here to close.

This is a quick, no-guilt check you can do at home in about 30 seconds, plus the same Body Condition Score (BCS) system UK vets use. If you'd rather skip the manual check and let our free tool do it for you, run a side-on photo of your dog through the Body Condition Inspector — you'll get a 1–9 score and a sensible next step in a minute or two.

The 30-second visual check (the one your vet does first)

Before any scales or charts, there are three things vets look at. You can do them all in your kitchen, while your dog is standing.

1. Ribs. Run your fingertips along your dog's side, just behind the front legs. You should be able to feel each rib clearly through a thin layer of fat — a bit like feeling your own knuckles through the back of your hand. If the ribs feel buried under a layer of padding, that's fat. If they feel like they're poking out through the skin, your dog may be underweight.

2. Waist (looking down from above). Stand over your dog and look at their outline. There should be a visible "tuck" behind the ribcage where the waist narrows before the hips. No tuck — straight sides like a sausage — usually means too much fat over the back and flanks.

3. Belly tuck (looking from the side). From the side, the underside of your dog should slope upwards from the ribcage to the back legs, not run flat or sag downwards. A flat or rounded belly line in an adult dog is one of the clearest signs of excess weight.

If two or more of those three checks don't sound like your dog, they are very probably carrying extra weight. One out of three is a maybe — worth confirming with the BCS scale below or the Body Condition Inspector.

What is a Body Condition Score, and why is it more useful than the scales?

A Body Condition Score is a 1-to-9 scale used by vets across the UK and globally (the version on the WSAVA chart is the one most UK practices reference). It assesses how much fat your dog is carrying relative to their frame — which matters more than a number on the scale.

Here's why. Two black Labradors of the same age and height can have wildly different "ideal weights" depending on their build, muscle mass, and bone frame. Generic breed-weight tables miss this completely. A working-line Labrador with a lean, athletic frame might be at a perfect weight at 28kg, while a heavier-set show-line Labrador of the same height might be ideal at 33kg. The BCS sidesteps that argument by looking at the dog in front of you, not the breed average.

The 1–9 scale is grouped into three bands:

• 1–3: Underweight. Ribs, spine and pelvic bones are easily visible, with very little fat cover. Often associated with illness or inadequate feeding.
• 4–5: Ideal. Ribs are easily felt with minimal fat cover, the waist is visible from above, and the belly tucks up from the side. This is the target.
• 6–9: Overweight to obese. Ribs are hard to feel, waist is reduced or absent, the belly is rounded or pendulous, and there are fat deposits over the lower back and tail base.

Most overweight UK dogs sit at a 6 or 7. A 9 is rare and usually associated with mobility loss and obvious distress. The good news: every step down the scale is achievable with consistent, modest changes — no crash diets, no drama.

Why it actually matters (the bit nobody enjoys reading)

Carrying extra weight isn't just cosmetic. The Royal Veterinary College's VetCompass programme — which tracks the health records of hundreds of thousands of UK dogs — has flagged obesity as one of the three conditions with the greatest combined welfare impact, alongside dental disease and osteoarthritis. The reason is duration: an overweight dog tends to stay overweight, so the impact compounds over years.

Practical consequences your vet will mention:

• Joints. Excess weight overloads the hips, knees and elbows. Overweight dogs are dramatically over-represented in lameness consultations, and weight loss alone is one of the most effective interventions for early-stage osteoarthritis.
• Lifespan. Long-running studies (the Cornell Riney Canine Health Center summarises the literature well) suggest overweight dogs live around two years less than lean-fed dogs of the same breed.
• Heat tolerance. A factor in UK summers. Overweight dogs overheat faster and recover more slowly.
• Anaesthetic risk and post-op recovery. Both worse in overweight dogs, which becomes relevant whenever surgery is on the cards (dentals, neutering, lump removal).

This isn't to scare anyone. It's to make the case that even modest weight loss — say, dropping from a BCS 7 to a BCS 5 — produces real, measurable quality-of-life gains.

What's actually causing the weight gain?

A few of these will probably feel familiar.

Neutering. Neutering can lower a dog's metabolic rate by around 25%. The food on the back of the bag doesn't account for that. If your dog was neutered and you didn't reduce portions, weight gain is the default outcome, not a personal failure.

Treats and table scraps. Treats sneak up. A single Bonio biscuit is around 50 kcal. Five a day is 250 kcal — roughly a fifth of a small dog's daily allowance. If multiple people in the house are giving treats, the maths gets ugly fast. The fix isn't "no treats" — it's counting them in.

Reduced exercise without reduced food. Often gradual. A dog ages, the walks get shorter, the food doesn't. UK winters compound this — shorter walks for three or four months can quietly add a kilogram.

Medical causes. Hypothyroidism (more common in middle-aged Labradors, Golden Retrievers and other gun-dog breeds) and Cushing's disease can both cause weight gain that resists calorie cuts. If your dog has gained noticeable weight without a change in food or activity, mention it to your vet — a blood test can rule these in or out quickly.

A realistic UK weight-loss plan

Forget crash diets. The vet-accepted target is 1–2% of body weight per week. That's deliberately gentle. Faster losses tend to come from muscle and water rather than fat, and rapid weight changes can trigger metabolic problems.

For a 30kg Labrador needing to lose 5kg, that's a 4–6 month plan. Not four weeks. Knowing that up front saves a lot of frustration.

The simplest version of the plan:

1. Weigh them today (a vet practice will let you use their walk-on scales for free in most cases). Record it.
2. Cut daily food by around 10% — measured in grams, not scoops. Keep the same food unless there's a clinical reason to change.
3. Replace treats with low-calorie alternatives — cucumber, carrot batons, green beans, plain cooked chicken in tiny pieces. Dogs care about the ritual, not the calories.
4. Add 10 minutes to one walk per day if joints allow.
5. Re-weigh in 4 weeks. If they've lost 4–8% (1–2% × 4 weeks), stay the course. If they've lost less, cut another 5–10%. If they've lost more, you're going too fast — add a little food back.

If your dog needs to lose more than 15% of their starting weight, or has medical complications, this is the point to involve a vet. They may suggest a prescription weight-loss diet, which is calibrated to keep protein and joint nutrients high while cutting calories. Browsing food options? Our Dog Food Directory lets you filter by calorie density and protein percentage. And during a weight-loss programme — particularly for older dogs — a daily joint supplement like Super Everyday is one of the small things that protects mobility while the kilos come off.

When to involve a vet

Most weight management is something you can run at home. Book a vet appointment if:

• Your dog has gained weight rapidly (more than 5–10% in a month) without a clear reason.
• You've cut calories sensibly for 6–8 weeks and the scale isn't moving.
• The belly looks pot-bellied or distended (rather than just rounded) — this can indicate Cushing's, fluid build-up, or an enlarged organ rather than fat.
• They're losing energy, drinking or urinating much more, or losing patches of fur — these point at endocrine issues, not lifestyle ones.
• You're not sure where to start. Most UK practices offer free nurse-led weight clinics; they're worth their weight in saved appointments later.

A quick reminder: this guide is general information. For anything that feels off about your specific dog, your own vet is the right call.

FAQ

How can I tell if my dog is overweight without a scale? Use the three-check method: feel for the ribs through a thin layer of fat, look from above for a waist behind the ribcage, look from the side for a belly that tucks up rather than running straight. Two or more failed checks usually means overweight.

What's a healthy weight for a Labrador / Golden Retriever / Cocker Spaniel? Breed averages are misleading. A "5 out of 9" Body Condition Score matters more than a number on the scales — two dogs of the same breed and height can have different ideal weights depending on frame and muscle. Use BCS as the primary measure, the scale as a way to track change.

Why is my dog gaining weight even though I haven't changed anything? Most often it's neutering (metabolic rate drops about 25%, and bag guidance doesn't adjust), gradual age-related metabolic slowdown, or a slow drop in walk length. Persistent unexplained weight gain warrants a vet check — hypothyroidism and Cushing's can both cause it.

How fast should an overweight dog lose weight? 1–2% of body weight per week is the safe range. Faster than that and dogs lose lean muscle. For a 30kg dog needing to lose 5kg, that's a 4–6 month plan, not a 4-week one.

Do I need to switch to a "light" food? Often not. A 10% portion cut on the existing food, plus low-calorie treats, is enough for many dogs. A prescription weight-loss diet makes more sense for dogs needing to lose more than 15% of body weight or with conditions like diabetes — a conversation to have with your vet.

What to do next

If you're 80% sure your dog is overweight, you're probably right — but get the score before changing anything, so you've got a starting point to measure progress against. Run a photo through the Body Condition Inspector. It'll give you a BCS, an estimated kilos-to-lose, and a 4-week starting plan tailored to your dog's age and breed. It takes about a minute. Then book your next 4-week check-in into your calendar — that single habit is what turns a good intention into a slimmer, springier dog by Christmas.