If you're wondering whether your dog has put on a bit more weight than they should, you're already doing the right thing by looking into it. And you're in very good company.
The PDSA's PAW Report consistently shows that a significant proportion of UK dogs are above their ideal weight, and vets across the country report seeing increasing numbers of overweight dogs year on year. It's one of the most common health concerns in dogs today, and one of the most fixable. A few simple checks at home can tell you a lot, and once you know where things stand, doing something about it is usually easier than you'd think.
How common is dog obesity in the UK?
More common than most people realise. Research from the PDSA suggests that around half of UK dogs may be above their ideal weight, and vets across the country report seeing increasing numbers of overweight dogs year on year.
It's easy to see how it happens. A few extra treats here, slightly generous portions there, a winter where walks got shorter. None of it feels dramatic at the time, but it adds up. And because we see our dogs every day, the slow changes are the hardest ones to spot.
The breeds most prone to gaining weight include Labradors, Cocker Spaniels, Cavalier King Charles Spaniels, Golden Retrievers, Beagles, and Pugs. If you own one of these breeds, you'll know the bottomless appetite and the permanent "I haven't been fed" expression all too well. But any breed can become overweight if diet and exercise drift out of balance.
How to tell if your dog is overweight: the at-home body check
You don't need scales to get a good idea of where your dog stands. There are three hands-on checks you can do right now that vets use as the starting point for every weight assessment.
Dr Scott Miller, practicing veterinary surgeon and Barking Heads ambassador, recommends starting with a simple visual and hands-on check. Looking down at your dog from above, they should have an hourglass shape with a slim waistline. Not a brick. Not a barrel. A gentle curve inward behind the ribs.
Next, run your hands along their sides. You should be able to feel the ribs clearly without pressing hard. If you can feel them with a light touch, your dog is likely in good shape. If there's a thick layer of padding and you're really having to search for them, that's extra weight.
Finally, look at your dog from the side. They should have a tight, tucked-up abdomen. The belly should rise up behind the ribcage, not sag down or hang level with the chest. Dr Scott notes that if your dog has a noticeable pouch hanging down, they could benefit from losing a bit of weight.
These three checks together, the waist from above, the rib feel, and the tummy tuck, give you a reliable picture. Vets use a more detailed version called a Body Condition Score, which rates dogs on a scale of 1 to 9 (with 4-5 being ideal). Your vet can talk you through exactly where your dog sits on that scale if you'd like a precise assessment.
Behavioural signs your dog might be carrying extra weight
The physical checks are the most reliable way to tell, but changes in your dog's behaviour can be just as revealing.
If your dog seems less enthusiastic about walks than they used to be, that's worth noticing. The same goes for panting during exercise that wouldn't have bothered them a year ago, reluctance to jump into the car or onto the sofa, taking longer to get up after lying down, or sleeping more than usual.
Reduced playfulness is another one. Dogs carrying extra weight simply have less energy to burn. If yours used to tear around the garden and now prefers to supervise from a comfortable spot, weight could be the reason.
If you're noticing a few of these alongside the body checks above, it's worth a chat with your vet.
What causes dogs to gain weight?
Most of the time, it comes down to eating more calories than they're burning. Portions that are slightly too generous, treats that add up throughout the day, and a routine that's become a bit less active than it used to be.
Portion sizes are a common starting point. The feeding guide on the packet is based on an average dog, and your dog might need less than what's suggested, especially if they're not very active or they've been neutered. Treats are the other big one. A few here and there seem harmless, but across the day, they can easily add a surprising number of extra calories to your dog's total intake. It's worth keeping treats to a small proportion of their daily food, and your vet can advise on what that looks like for your individual dog.
Neutering plays a role, too. It doesn't directly cause weight gain, but it can change your dog's metabolism and appetite. Research suggests neutered dogs may need noticeably fewer calories to maintain a healthy weight. Most owners don't adjust portions after the operation, and the weight can start creeping on within the first couple of years.
Age is another factor. Older dogs tend to have slower metabolisms and are often less active, but their bowls often stay the same size.
And sometimes there's a medical cause behind it. Hypothyroidism and Cushing's disease can both lead to weight gain that isn't connected to diet or exercise. If your dog is putting on weight without any obvious explanation, your vet can run blood tests to check for underlying conditions. Our guide on why your dog might be gaining weight covers all the common causes in more detail.
Why does it matter? The health risks of extra weight
A bit of extra weight might look harmless, but it puts real strain on your dog's body over time.
Joint problems are one of the most common consequences. Every extra kilogram means more pressure on the hips, knees, and elbows with every step. Over time, this can wear down cartilage and may make conditions like arthritis worse. Dogs with sore joints move less, which can lead to more weight gain. It's a tough cycle to break once it gets going.
Heart disease, diabetes, breathing difficulties, and increased risk of certain cancers have all been associated with excess weight. Overweight dogs also overheat more easily and may have a harder time under anaesthesia if they ever need surgery.
Research from the University of Liverpool studying over 50,000 dogs found that overweight dogs can live up to two and a half years less than dogs at a healthy weight. That's two and a half years of walks, belly rubs, and time together. Worth fighting for.
The encouraging thing is that every one of those risks starts to reduce as soon as the weight starts coming off. Even modest weight loss can make a real difference to how your dog feels and moves.
What to do if your dog is overweight
First things first: see your vet. They can confirm whether your dog is genuinely overweight, rule out any medical causes, and help you set a realistic target weight.
Dr Scott Miller's approach is all about gradual, sustainable change rather than extreme restriction. Crash diets don't work for dogs any more than they work for humans. They leave your dog hungry, miserable, and at risk of losing muscle instead of fat.
Start with the food. Measure portions properly using kitchen scales every time, as bulk density can differ from batch to batch. Feed for your dog's target weight rather than their current weight, and take an honest look at how many treats are going in each day. Swapping high-calorie treats for raw carrot, cucumber, or apple slices can make a surprising difference without your dog feeling like they're missing out.
A recipe designed specifically for weight management can make the whole process easier. Fat Dog Slim was built for exactly this. Dr Scott Miller recommends it as a complete diet tailored for weight loss. It contains 50% chicken with just 9.5% crude fat, 30% less fat than our standard recipes. It includes L-carnitine which may help support fat metabolism, slow-release carbs from oats to help keep your dog feeling fuller between meals, and glucosamine and chondroitin which may help support joints. Overweight dogs need their joints looked after while the weight comes off.
It's available in both dry and wet recipes, so you can mix and match to keep mealtimes interesting. If you're switching from a different food, we always recommend doing so over a two-week period, starting with around 10% new food and 90% current food, and gradually increasing the new food each day.
Exercise matters too, but build it up gradually. If your dog has been less active, start with short, gentle walks and add a few minutes each week as their fitness improves. Getting them moving more consistently is what counts. For more detailed advice, our guide on how to help your dog lose weight covers the full step-by-step plan. Or, learn about the best low fat dog food.
How to help your dog maintain a healthy weight long-term
Getting to the right weight is one thing. Staying there is where the real win happens.
Regular body condition checks at home keep you on track. Run through the rib test, waist check, and tummy tuck every few weeks. You'll spot any changes early, before they become a problem.
Weigh your dog every month or so if you can. Many vet practices have walk-in scales and are happy for you to pop in for a quick weigh. Keeping a note of the numbers over time gives you a clear picture of whether things are holding steady.
Stay consistent with portions and treats. It's easy to let things drift once your dog looks healthy again. The habits that got the weight off are the same habits that keep it off.
And keep exercise fun. Walks, swimming, fetch, exploring new routes. The more your dog enjoys being active, the easier it is to maintain. Once they've got that bounce back in their step, you won't want to let it go.
Keeping your dog at a healthy weight isn't a phase. It's an ongoing act of love. Every measured meal, every walk in the rain, every time you resist those pleading eyes at the dinner table. It all adds up to a happier, healthier, longer life together. And that's what feeding them well is really about.
FAQs
How can I tell if my dog is overweight without scales?
Use the three at-home body checks: run your hands along their sides to feel for ribs (you should feel them easily), look from above for a visible waist behind the ribs, and check from the side that the belly tucks up behind the ribcage. If the ribs are hard to find, the waist has disappeared, or the tummy hangs low, your dog is likely carrying extra weight.
What is a Body Condition Score for dogs?
A Body Condition Score is a system vets use to assess whether a dog is underweight, ideal, or overweight. It uses a scale of 1 to 9, where 1 is severely underweight and 9 is obese. A score of 4 to 5 is considered ideal. Your vet can assess your dog's score during a routine check-up and show you what to look for at home.
Which dog breeds are most prone to weight gain?
Labradors, Cocker Spaniels, Cavalier King Charles Spaniels, Golden Retrievers, Beagles, and Pugs are all more prone to gaining weight. Labradors have a known gene mutation that affects their feeling of fullness after eating. Being a predisposed breed doesn't make weight gain inevitable, but it does mean being more careful with portions and exercise.
Can neutering cause my dog to gain weight?
Neutering doesn't directly cause weight gain, but it can change your dog's metabolism and appetite. Neutered dogs may need noticeably fewer calories than before the operation, and their appetite often increases at the same time. Adjusting portions after neutering with your vet's guidance and keeping exercise consistent can help prevent weight gain.
How much exercise does an overweight dog need?
Start gently with short walks on flat ground once or twice a day. Build up gradually, adding a few minutes each week. Swimming is excellent for overweight dogs because it's low-impact on joints. Always check with your vet before increasing exercise, especially if your dog has joint problems.
What should I feed an overweight dog?
A weight management recipe that's lower in fat but still provides adequate protein, vitamins, and minerals is a good option. Your vet can advise on the right food and daily amount for your dog's target weight. Our guide to choosing the best low-fat dog food covers what to look for in more detail.
How quickly should my dog lose weight?
Healthy weight loss in dogs is gradual, and your vet can advise on a safe and realistic pace for your individual dog. Most dogs take several months to reach their ideal weight, and that's perfectly normal. Regular vet check-ins help keep things on track and ensure your dog is losing fat rather than muscle.
Is my dog overweight or just fluffy?
Some breeds have thick double coats that can make them look bigger than they are. The best way to tell is to feel rather than look. Run your hands along their sides and try to feel the ribs. If you can feel them with a light touch through the coat, your dog is likely fine. If there's a thick layer of padding between your hands and the ribs, that's weight rather than fluff.
Dog and cat weight loss advice from vet Dr Scott Miller
