Few things in dog ownership are as easy to miss, or as hard to fix, as a dog that has quietly put on weight. It happens gradually, a few extra treats here, a slightly bigger scoop there, a winter of shorter walks, and one day the vet mentions it or you notice that your dog no longer takes the stairs in one bound. The good news is that excess weight is one of the most reversible problems in canine health. The harder part is doing it safely: too fast and you risk muscle loss, too vague and nothing changes, and on your own you can miss an underlying medical cause.
This guide pulls together advice from PDSA, Blue Cross, the Kennel Club, the British Small Animal Veterinary Association (BSAVA), the Royal Veterinary College, and a US veterinary hospital network, VCA, as well as a few studies. It covers how to tell whether your dog is overweight, why you should start with a vet, how fast weight can safely come off, how to handle meals and treats, how to build exercise up gently, and what to do when progress stalls. Where sources disagree, or where a figure comes from a source with a commercial interest, we say so. A few simple tools help: kitchen scales for weighing food, a tin for the day's treats, and for the walks themselves a comfortable, well-fitted harness such as our Big Trail Harness, which is padded, adjustable and comes in four sizes.
One note before we start. This is general information, not veterinary advice. Every source we read says weight-loss plans should be individual, and your vet is the person who can set a target weight and a daily amount of food for your particular dog.
How common is a dog carrying too much weight?
Very common, though the figures depend on who is counting. PDSA says vets estimate that nearly half of dogs in the UK are overweight. The Kennel Club puts the figure at around 45 percent, citing a 2014 PFMA white paper. A 2024 owner survey of more than 8,900 British households, reported by GlobalPETS and attributed to UK Pet Food, found that 50 percent of dogs were overweight, up from 45 percent a decade earlier. The same report said that 77 percent of owners thought their pets were a healthy weight and only 4 percent acknowledged that their pets needed to lose weight, which hints at one reason the problem persists. It also said 37 percent of owners give pets human food, and that vets attributed obesity to table scraps in 26 percent of cases and to overfed commercial treats in 29 percent.
A very different number comes from the Royal Veterinary College. Its VetCompass study of 22,333 dogs recorded 1,580 as overweight, about 7.1 percent, or roughly 1 in 14. That does not contradict the other figures. It reflects dogs whose weight was recorded as a problem in veterinary records, and the RVC itself notes that the number likely undercounts, because not every overweight dog is seen by a vet for it. The survey figures are owner-reported, and the GlobalPETS article does not say whether the 50 percent figure came from owners or vets. The sensible reading is that a large share of UK dogs are carrying extra weight, that exact percentages are uncertain, and that many owners do not realise.
Why it matters for your dog
PDSA links obesity to arthritis, diabetes, Cushing's disease, urinary incontinence, back problems such as slipped discs, cruciate ligament problems, breathing problems including windpipe and laryngeal collapse, certain cancers, heatstroke, injury, problems under anaesthetic, and a reduced lifespan. In flat-faced breeds it adds BOAS, the breathing condition associated with short muzzles. Blue Cross lists a shorter life and a higher risk of arthritis, breathing problems, heart disease and cancer. The Royal Veterinary College study links obesity to shortened lifespans, reduced quality of life and higher rates of arthritis, breathing problems, heart disease, diabetes and certain cancers, though it does not give a figure for lifespan lost.
One study often cited on lifespan deserves context. In research published in 2002 and reported by Penn Today, 48 Labrador retrievers from seven litters were paired by littermate, and one dog in each pair was fed 25 percent fewer calories than its sibling from eight weeks of age. The restricted dogs had a median lifespan of 13 years against 11.2 years for the others, a difference of 1.8 years, and they developed hip osteoarthritis later. It is striking, but it was a small study of one breed, it involved lifelong feeding restriction from puppyhood rather than weight loss in an overweight adult, and it was funded and conducted by Nestlé Purina. Treat it as supportive evidence that leaner is healthier, not as a recipe.
The Kennel Club offers an encouraging counterpoint: it says conditions such as heart disease, joint problems and diabetes linked to excess weight are largely reversible. That is a reason to act now.
Is your dog actually overweight? The body condition score
The scales help, but shape matters more. Vets use a 9-point body condition score, where the middle of the scale is ideal. PDSA's home check uses your eyes and your hands. Look from the side and from above: you should see a waist, and the tummy should tuck up rather than bulge. Feel along the back: you should be able to feel the spine and hip bones under the skin but not see them. Run your hands along the ribs: you should feel them with a light touch, with the skin moving freely over them. Check the base of the tail for any build-up of fat. Blue Cross offers a similar test, looking from above for a waist and a body that tapers after the ribs, and feeling the ribs easily without seeing them prominently, and it notes that a potbelly can signal excess weight.
The Kennel Club lists other signs: a rounder face, reluctance to walk, tiredness, and ribs that are hard to feel. If several apply, book a weigh-in and a body condition score. PDSA says many vet practices run weight clinics, and some have waiting-room scales you can use without an appointment, which is a handy, free way to start. Our guide to keeping an older dog comfortable as temperatures drop also describes a monthly body-shape check you can do at home.
See your vet first
It is tempting to start by cutting the portion in the bowl, but every source we read recommends a vet check first. PDSA says plans should be individual and that you should ask your vet practice for help. Blue Cross says to see your vet to rule out medical causes and to check for conditions that could affect weight loss. The BSAVA position statement on obesity, last modified in August 2025 and reviewed by Professor Alex German and members of its Scientific Committee, recommends a clinical assessment with history, physical examination and further tests if needed, a body condition score, and a target weight set according to the aims of the case. It adds that weight loss is best started when the dog is otherwise well.
Diet and activity are the usual causes, according to PDSA, but medical conditions such as hypothyroidism and Cushing's disease are rarer causes, and steroids can increase appetite and cause weight gain. Neutering can matter too: PDSA says neutered dogs may need fewer calories because hormonal changes can increase appetite and slow metabolism. The Royal Veterinary College study found neutered males had the highest sex-related risk at 1.9 times that of entire females, and dogs aged six to under nine had almost three times the risk of dogs under three. Breed matters: the RVC found higher risk than crossbreeds in pugs (3.12 times), Beagles (2.67), Golden Retrievers (2.58), English Springer Spaniels (1.98), Border Terriers (1.72), Labradors (1.70), Cavalier King Charles Spaniels (1.50) and Cocker Spaniels (1.32), and lower risk in Shih Tzus and German Shepherds. PDSA names Labradors, Golden Retrievers, Pugs, Cocker Spaniels and Cavaliers as more likely to be overweight, and says an appropriate diet and exercise can keep them at a healthy weight.
The BSAVA statement also notes that no licensed drugs for weight loss in companion animals are currently available, so be wary of any product that promises an easy fix. The proven tools are less exciting: measured food, appropriate exercise and regular monitoring.
How fast is safe? The pace of weight loss
Slow and steady is the consistent message, though the sources give slightly different figures. BSAVA says reported weight loss rates in dogs with obesity are between 0.5 and 2 percent of body weight per week, that average rates in pet dogs are usually below 1 percent per week, and that faster loss from bigger cuts in food intake is linked to greater muscle loss. It says targets should prioritise health and wellbeing over rate or percentage, and that a modest loss of 6 to 9 percent of body weight can still give measurable health benefits. VCA gives a general guideline of between 0.5 and 2 percent per week, with the actual rate set by your vet. Petplan, a pet insurer, says dogs should not lose more than 2 percent of bodyweight per week, with 1 percent considered safe and reasonable.
To make that concrete, a dog weighing 30kg losing 1 percent a week would lose 300g a week, which is our own arithmetic rather than a figure from the sources. It adds up to roughly 1.2kg over a month, which feels slow but is the point. Rapid loss is not just uncomfortable for a hungry dog, it is the kind of loss BSAVA associates with muscle loss. One UK website we looked at that warns of liver problems from crash diets belongs to a pet cremation company, so we have not relied on its claims, but the wider message of avoiding crash diets matches the veterinary sources.
What to feed: the food plan
The BSAVA statement is clear that the main strategy is dietary energy restriction using a purpose-formulated diet, together with more physical activity and close monitoring by a veterinary professional. The diet should be either a manufactured weight management diet or a home-prepared recipe formulated by a qualified veterinary clinical nutritionist. It cautions that diets labelled light but designed for maintenance can risk nutrient deficiencies. For a dog with a body condition score of 6 on a complete and balanced diet, a reduction of up to 20 percent in current intake might be effective, while dogs at 7 and above usually need marked, prolonged energy restriction. PDSA similarly says a weight reduction food with suitable fat, protein and nutrient levels is often the best option, and that you should ask your vet or vet nurse how much to give.
Blue Cross is more flexible for mild cases. It suggests weighing the daily ration, cutting back treats first, and moving to a calorie-controlled diet if simple changes do not work, with your vet setting the daily amount and scheduling check-ups. If you reduce regular food instead, it says a light version measured to a target weight can help, and that if there is no progress after two months you should see your vet. Blue Cross and Petplan both say to feed to the target weight, not the current weight.
We have not included a calorie formula. One popular US article we read gave a calculation but is a paid advertisement for a fresh-food company, and its figures should be checked with your vet. Your vet can work out the daily amount for your dog's target weight and adjust it over time.
Measure everything and get the whole household on board
The single most useful habit is weighing food. BSAVA recommends measuring food accurately, ideally with scales, and adjusting amounts based on weight and body condition changes. VCA says the same: use a kitchen scale for dry food, which is more accurate than a cup or scoop. Cups vary enormously, and a heaped scoop can hold far more than a level one, which is how a small daily excess builds up over months.
Blue Cross suggests keeping a food diary for a few days, recording all meals, scraps and treats, and making sure everyone in the household follows the plan. That includes grandparents, neighbours and dog walkers. VCA makes the same point for pets that are not losing weight: check that everyone feeding the pet, including neighbours, friends and pet sitters, is following the plan and not giving extra treats. Pre-measuring the day's treats into a container so that everyone knows when they are gone is a simple trick that VCA recommends. If your dog is eating less than the packet suggests and still gaining, the diary will often show where the extras are coming from.
Slow down mealtimes and turn food into an activity
A smaller portion can feel like a punishment if it vanishes in ten seconds. Blue Cross suggests slowing down mealtimes with slow-feeder bowls or snuffle mats, and VCA suggests food puzzles to add activity without extra food. The bowl does not change how many calories are in the meal, but it can make a smaller meal last longer and give your dog something to do.
Two of our products fit this role. The Big Slow is a maze-style puzzle feeder bowl with a non-slip base, dishwasher safe, designed for small to medium breeds, and it works with kibble, wet food or treats. The Big Spread is a silicone tray with a removable bowl insert, a maze slow-feed zone, a honeycomb lick zone and a textured nub zone, and its listing says it is dishwasher safe and can be frozen. The listings make claims about bloat and regurgitation risk, which we have not independently verified, so we would pitch these as enrichment tools, not medical ones. For ideas on how to use them, our guide to puzzle toys for dogs explains the basics, and Blue Cross notes that you can use kibble from the daily ration as a reward, so feeding toys do not add calories if you load them from the same allowance.
Treats: the stealth calories
Treats are where good intentions often leak. VCA says treats, snacks and people food combined should make up no more than 10 percent of daily calories, which is also a common guideline in other sources. Petplan puts it neatly: treats need to come out of the daily ration, not on top of it. Blue Cross agrees: if your dog gets extra treats, reduce the meal that day. VCA describes low-calorie dog treats as having fewer than 15 calories per piece, so check the label.
Blue Cross suggests carrot, cucumber or rice cakes as healthier treats kept very small, and kibble from the daily ration. Our guide to pumpkin for dogs covers another low-calorie option, though check with your vet before adding anything new to a dog on a weight-loss plan. Some foods that are fine for people can harm dogs, grapes being a well-known example, so do not improvise.
Non-food rewards matter just as much. Petplan suggests attention or play when your dog begs, and Blue Cross says to use walks and games as rewards instead of food. A tug game or a short training session earns just as much tail-wagging as a biscuit. If your dog begs at the table, that is the moment to redirect rather than give in, and it helps if everyone in the house responds in the same way. UK Pet Food's 2024 report said that of owners who give pets human food, 22 percent do it to feel closer to their pets, which is a kind way of saying that sharing food is love. Replace it with another kind of sharing, such as a game or a cuddle.
Exercise: build up gently, and do not expect it to do the whole job
Exercise is part of the plan but it is not the whole plan. BSAVA says exercise alone does not produce meaningful weight loss, but it helps preserve muscle while the dog is eating less. PDSA says to increase exercise alongside diet changes, with the amount depending on age, breed and health. Blue Cross says to increase exercise gradually, aiming for at least two outings a day, adding active play. VCA advises increasing activity by about a minute or two each day, with short sessions two or three times a day, putting food or water at the top or bottom of stairs, and asking your vet about supervised rehabilitation if pain or mobility limits exercise.
Start where your dog is, not where you wish it was. A dog that has been walking 15 minutes a day will not suddenly cope with an hour on a hilly route. The Kennel Club notes that reluctance to walk is itself a sign of excess weight, so be patient and make the walks pleasant. Short, frequent outings, a change of route for new smells, and a slow pace on a lead that does not pull all help. Flat, forgiving surfaces are kinder to joints, and our guide to the best walking surfaces for dogs' joints goes through the options. For older dogs, our guide to easy dog walks for older dogs in Lancashire lists gentle routes.
On days when the weather is poor, our guide to the best indoor activities for dogs during the UK winter has ideas, and our piece on mental versus physical exercise explains why sniffing games and puzzles count too. The Kennel Club warns about winter weight gain, and Blue Cross suggests reducing food if activity drops, so keep an eye on the scales when the days draw in.
Heat, breathing and the extra risks of carrying weight
PDSA lists heatstroke and breathing problems among the risks of obesity, including BOAS in flat-faced breeds. In practice, that means an overweight dog needs more care in warm weather, and Blue Cross says to take care with elderly dogs in hot weather when increasing exercise. Walk in the cooler parts of the day, carry water, and stop if your dog starts to pant heavily or slows down. If your dog is a flat-faced breed, ask your vet how much exercise is sensible. Our guide to helping dogs stay cool in hot weather covers the practical side.
Weigh-ins and tracking progress
Progress is easier to keep going when you can see it. VCA says that if you cannot weigh your pet at home, visit your vet clinic about every two weeks to use its digital scale, at the same time of day each time, and recommends taking photos from the side and above, using body condition scoring and keeping a food and activity diary. PDSA says to weigh your dog regularly, and to keep doing so after it reaches its ideal weight to help maintain it. BSAVA describes a care plan with a weight-reduction phase followed by a maintenance phase, so the work does not end when the number on the scale does.
Expect the weight to move slowly, and judge by trend rather than any single weigh-in. A photo every fortnight can show a waist appearing before the scales catch up. If your vet clinic runs a weight clinic, use it: PDSA says many do, and the nurses can adjust the plan as your dog changes.
When the weight will not budge
It is common to hit a plateau. VCA says that if a pet is not losing weight you should check that everyone feeding the pet is following the plan, review your original goals with your vet, and expect that your vet may adjust the food amount or recommend a different therapeutic weight-loss diet. Blue Cross says that if there is no progress after two months of the simple approach, you should see your vet. Medical causes such as hypothyroidism and Cushing's disease are rarer but real, and PDSA notes that steroids can cause weight gain, particularly if they increase appetite. Do not respond to a plateau by slashing the ration yourself, because BSAVA associates faster loss with muscle loss.
Protect the joints while the weight comes off
Extra weight and sore joints feed each other: a dog that hurts moves less, and a dog that moves less gains more. Blue Cross and PDSA link excess weight with arthritis, and the Kennel Club with joint conditions, and our guide to spotting joint stiffness early in dogs explains the early signs. If your dog is slower to get up or hesitates at the stairs, tell your vet, because pain relief and a physical-activity plan may be part of the answer. Our piece on helping an older dog in and out of bed and our overview of how dogs change as they get older are good companions to this one.
Small changes at home reduce strain. Our Big Step is a solid wooden ramp with a non-slip carpeted surface and height-adjustable legs, in 70cm and 100cm lengths, designed for the car boot and the sofa, and its listing notes that repeated jumping can strain joints. Somewhere supportive to rest matters as well. The Big Snooze Pro has memory foam, bolster sides, a non-slip base and a cover that washes at 30°C, and its listing recommends it for senior dogs with arthritis. It is a comfort aid, not a treatment, and it does not replace the weight loss.
Be kind to yourself, and to your dog
BSAVA says vets should hold supportive, non-judgemental conversations with owners and use non-stigmatising language, and that is good advice for owners to apply to themselves. Many owners overfeed out of affection. Dogs ask for food with their whole bodies, and the habit of saying yes is easy to fall into. The aim is not to feel guilty but to swap one form of care for another: a measured meal, a game, a slightly longer walk and a weigh-in that you celebrate. A leaner dog is likely to be a more active, more comfortable dog for longer, and the Kennel Club notes that many of the effects of excess weight are largely reversible.
The final word
Helping an overweight dog lose weight safely comes down to a handful of habits: see the vet first, set a target weight, weigh the food, count the treats, build exercise up gradually, weigh in regularly and be patient. Aim for roughly 0.5 to 2 percent of body weight a week at most, and usually less, with your vet setting the pace. When in doubt, ask your vet and your vet nurse, because they can see what the internet cannot: your dog.
Q: How fast should an overweight dog lose weight?
A: BSAVA says reported rates are between 0.5 and 2 percent of body weight per week, with the average in pet dogs usually below 1 percent, and that faster loss from bigger cuts in food is linked to greater muscle loss. VCA gives the same 0.5 to 2 percent range. As an example of our own arithmetic, a 30kg dog losing 1 percent a week would lose 300g. BSAVA also notes that a modest loss of 6 to 9 percent of body weight can still produce measurable health benefits, so a slow plan is not a failure. Your vet sets the actual target and the rate for your dog.
Q: Can I just feed my dog less of its normal food?
A: Sometimes, for a mild case, but ask your vet first. BSAVA says a dog with a body condition score of 6 on a complete and balanced diet might respond to a reduction of up to 20 percent in current intake, while dogs at 7 and above usually need marked, prolonged restriction, which is best done with a purpose-formulated weight management diet under veterinary supervision. It warns that diets labelled light but designed for maintenance can risk nutrient deficiencies. Blue Cross says a light version measured to a target weight can help, and to see your vet if there is no progress after two months. Always base the amount on the target weight, not the current weight.
Q: Do I have to stop all treats?
A: Not necessarily, but they must count. VCA says treats, snacks and people food combined should be no more than 10 percent of daily calories, and Petplan says treats should come out of the daily ration, not on top of it. Blue Cross suggests very small pieces of carrot, cucumber, rice cakes or kibble from the daily ration, and using walks and games as rewards instead of food. Pre-measure the day's treats in a container so the whole household knows when they have gone. Check with your vet before adding new foods, and avoid grapes.
Q: Will more walks be enough on their own?
A: Probably not. BSAVA says exercise alone does not produce meaningful weight loss, but it helps preserve muscle while a dog is eating less, so it is a valuable partner to a measured diet. PDSA says to increase exercise alongside diet changes, with the amount depending on age, breed and health. Blue Cross advises increasing gradually, aiming for at least two outings a day, and VCA suggests adding a minute or two each day with short sessions two or three times a day. If your dog is stiff or painful, ask your vet about supervised rehabilitation before pushing the pace.
Q: My dog is not losing weight even though I am following the plan. What now?
A: First check the hidden extras: VCA says to make sure everyone feeding the dog, including neighbours and pet sitters, is following the plan, and Blue Cross suggests a food diary recording every meal, scrap and treat. Then speak to your vet, who can review your goals, check for medical causes such as hypothyroidism or Cushing's disease, ask about any steroid treatment, and adjust the amount or switch to a different weight-loss diet. Blue Cross says to see the vet if there is no progress after two months. Avoid cutting food further on your own, because BSAVA links faster weight loss with muscle loss.
— Joseph, The Big Pet Shop, Bacup, Lancashire 🐾