UK dog obesity: the real numbers
According to the PDSA’s 2024 PAW Report, roughly 40-50% of dogs in the UK are carrying excess weight. That’s somewhere between 4 and 5 million dogs. The British Veterinary Association (BVA) has described pet obesity as one of the biggest welfare issues facing UK dogs.
Vets see the consequences every day: joint problems, diabetes, heart disease, breathing difficulties, liver disease, and a shorter lifespan. Overweight dogs live, on average, 1.8 years less than dogs at a healthy weight. That’s nearly two years of life lost to a preventable problem.
The causes are simple: too many calories, not enough exercise, and a lot of well-meaning owners who don’t realise their dog is fat. We’ve become so used to seeing overweight dogs that a dog at a healthy weight can look “too thin” to people who are used to seeing rolls and sagging bellies as normal.
The good news is that helping your dog lose weight doesn’t require expensive prescription diets or specialist vet clinics. It requires honest portion control, regular exercise, and choosing the right food. And you can do all of that on a budget.
How to tell if your dog is overweight
The most reliable method is the body condition score (BCS). It’s a 9-point scale used by vets, and you can do it yourself at home.
Look at your dog from above. You should be able to see a visible waist behind the ribs. If your dog’s body looks like a sausage from above, with no indent at the waist, they’re carrying extra fat.
Look at your dog from the side. Their belly should tuck up from the chest, not hang straight or sag. The chest should be the lowest point when standing.
Feel your dog’s ribs. You should be able to feel them easily with light finger pressure, like feeling the bones on the back of your hand. If you have to press hard to find them, or can’t find them at all, your dog is overweight. If the ribs are visible without touching (on a short-haired dog), your dog might be underweight.
On the 9-point BCS scale, a score of 4-5 is ideal. A score of 6-7 is overweight. A score of 8-9 is obese. If you’re unsure, ask your vet to assess your dog at their next check-up. Most practices will do this for free and give you a target weight.
The RSPCA has a useful body condition guide on their website with pictures showing what each score looks like on different body shapes.
How many calories does your dog actually need?
This varies hugely based on your dog’s size, age, activity level, and current body condition. But here are rough guidelines for maintenance calories (not weight loss) for a typical neutered adult dog:
- 5kg dog (Jack Russell type): 450-550 kcal/day
- 10kg dog (Cockapoo type): 700-850 kcal/day
- 20kg dog (Border Collie type): 1000-1200 kcal/day
- 30kg dog (Labrador type): 1300-1600 kcal/day
For weight loss, your dog needs roughly 60-70% of their maintenance calories. That’s a significant reduction, and it’s why diet food can help: it’s designed to be lower in calories while still filling your dog up.
The problem with simply feeding less of your dog’s normal food is that they’ll feel hungry. Standard dog food is calorie-dense. A smaller portion means less food in the bowl, less chewing, and a dog that stares at you like you’ve forgotten something important. Weight management foods are formulated to be less calorie-dense, so your dog can eat a larger volume of food while taking in fewer calories.
The FEDIAF guidelines include specific nutrient profiles for weight management foods, including minimum protein levels (to prevent muscle loss during dieting) and maximum fat levels.
What makes a good weight management food?
A proper weight management dog food (often labelled “Light” or “Reduced Fat”) has several key characteristics:
Lower calorie density: Standard dog food typically provides 350-400 kcal per 100g. Light foods usually sit around 250-320 kcal per 100g. That means your dog can eat a larger portion for fewer calories.
Higher protein: When a dog loses weight, you want them to lose fat, not muscle. A higher protein percentage (typically 25-30%+ in weight management foods) helps maintain lean muscle mass during calorie restriction.
Lower fat: Fat is the most calorie-dense macronutrient (9 kcal per gram vs 4 kcal per gram for protein and carbs). Reducing fat is the easiest way to reduce calories without making the food look sparse. Most light foods have fat content around 7-12%, compared to 12-20% in standard foods.
Higher fibre: Added fibre (from beet pulp, chicory, or similar sources) helps your dog feel full. It slows digestion and keeps blood sugar stable, which reduces the between-meal begging that makes dieting miserable for everyone involved.
L-carnitine: Some weight management foods include L-carnitine, an amino acid that helps the body metabolise fat. The evidence for its effectiveness in dogs is mixed, but it’s a common inclusion and unlikely to do any harm.
Best budget weight management foods in the UK
Harringtons Light
Harringtons is one of the best-known budget dog food brands in the UK, and their Light formula is a solid weight management option. It’s a complete dry food with 25% protein, 7% fat, and around 300 kcal per 100g.
The ingredient list is reasonable: chicken meal as the primary protein, rice and barley as carbohydrate sources, and added fibre from beet pulp. No artificial colours or flavours. It’s not the most exciting ingredient list you’ll ever read, but it works.
Pricing is very competitive. Expect to pay around £2.50-3.50 per kg if you buy the 12kg or 15kg bags, which works out at roughly 80p-£1.20 per day for a 20kg dog. That’s genuine budget territory for a purpose-made weight management food.
All About Dog Food rates Harringtons around 3.5-4 stars, which is strong for the price point.
Skinners Field & Trial Lightweight
Skinners makes excellent working dog food, and their Lightweight formula is popular with owners whose dogs need to shed a few kilos. It’s got 25% protein, 10% fat, and around 340 kcal per 100g.
The calorie density is slightly higher than Harringtons Light, so portion control matters more here. But the protein content is good for maintaining muscle during weight loss, and the ingredient quality is solid for the price.
Skinners is widely available online and at country stores. The 15kg bags typically cost £35-40, which works out at roughly £2.30-2.70 per kg. That’s excellent value for a food with this protein level.
One thing to watch: this is designed for active dogs, so the calorie content is a bit higher than some other light foods. If your dog is very inactive, you might need to feed slightly below the recommended portion to see results.
Burns Weight Control
Burns is a well-respected UK brand that focuses on simple, hypoallergenic recipes. Their Weight Control food (also labelled as Burns Sensitive Light in some ranges) has 18.5% protein, 7.5% fat, and around 310 kcal per 100g.
The lower protein content might concern some owners, but Burns has always taken a conservative approach to protein levels, arguing that moderate protein is easier on the kidneys and digestion. The food includes brown rice, oats, and peas as fibre sources to keep your dog feeling full.
Burns is a bit pricier than Harringtons or Skinners, at roughly £4-5 per kg. But it’s still well within budget territory, especially compared to prescription weight management diets that can cost £6-10 per kg. If your dog has a sensitive stomach alongside a weight problem, Burns is a smart choice.
The brand has a strong reputation among UK vets, and many recommend Burns for dogs with both digestive and weight issues. The cheap vs premium comparison covers where Burns sits on the value spectrum.
Wagg Weight Control
Wagg is about as budget as UK dog food gets, and their Weight Control formula proves you can help your dog lose weight without spending much at all. It’s got 20% protein, 7% fat, and around 290 kcal per 100g.
The calorie density is genuinely low, which makes it easier to feed a satisfying portion while keeping calories down. The ingredient list includes chicken meal, whole wheat, maize, and beet pulp for fibre.
Wagg is cheap. Really cheap. Expect to pay around £1.50-2 per kg for the larger bags, which works out at 40-70p per day for a 20kg dog. For owners on the tightest budgets who still want a proper weight management food rather than just feeding less standard food, Wagg is hard to beat.
The best cheap dog food guide covers Wagg in more detail alongside other budget options.
Senior foods as a weight management hack
Here’s a tip that can save you even more money. Senior dog foods are often formulated similarly to weight management foods: lower fat, moderate protein, higher fibre. If you can’t find a specific “Light” or “Weight Control” product that suits your dog, many senior foods will do a similar job.
Harringtons Senior, James Wellbeloved Senior, and similar products typically have fat content around 8-10% and calorie densities lower than standard adult foods. They’re designed for older dogs with slower metabolisms, which means they work reasonably well for younger overweight dogs too.
The main difference is that senior foods might include joint supplements (glucosamine, chondroitin) that a younger dog doesn’t strictly need. That’s not a problem. Those extras won’t hurt and might actually help if your overweight dog is already putting extra strain on their joints.
Price comparison table
| Food | Protein | Fat | Price per kg | Daily cost (20kg dog) |
|---|---|---|---|---|
| Wagg Weight Control | 20% | 7% | £1.50-2.00 | 40-70p |
| Harringtons Light | 25% | 7% | £2.50-3.50 | 80p-£1.20 |
| Skinners Lightweight | 25% | 10% | £2.30-2.70 | 75p-£1.10 |
| Burns Weight Control | 18.5% | 7.5% | £4.00-5.00 | £1.30-£1.60 |
Even the most expensive option on this list (Burns) costs roughly £1.50 per day for a 20kg dog. Compare that to prescription weight management diets from your vet, which can run £3-5 per day for the same size dog. The savings are substantial, and the nutritional quality is still good.
Feeding tips that actually work
Buying the right food is only half the battle. How you feed matters just as much as what you feed.
Weigh everything. Don’t guess. Don’t use a scoop and assume it’s the right amount. Get a cheap kitchen scales and weigh your dog’s food to the gram. The difference between 180g and 220g of kibble might be 100 calories, which over a week adds up to a full day’s worth of food.
Use the target weight, not the current weight. Feeding guides on dog food bags are based on your dog’s ideal weight, not what they currently weigh. If your 25kg dog should be 20kg, follow the feeding guide for a 20kg dog. This is the single most common mistake owners make when trying to help their dog lose weight.
Stop the treats. Or count them. Treats are calorie bombs. A single Dentastix is about 80 calories. A Bonio is about 65 calories. If your dog gets three treats a day, that’s 200-250 extra calories, which is roughly 15-20% of their daily allowance. If you must treat, use a small portion of their daily kibble ration instead. Your dog doesn’t care. They just want the interaction.
Feed at set times. Free-feeding (leaving food in the bowl all day) makes it nearly impossible to track calories. Two set meals per day works for most adult dogs. Pick up the bowl after 15-20 minutes if they haven’t finished. They won’t starve.
Add vegetables for bulk. Carrots, green beans, and broccoli are low-calorie, high-fibre additions that help your dog feel full without adding significant calories. Steam or microwave them (no butter, no seasoning) and mix them into the kibble. Most dogs enjoy the texture and flavour. A handful of green beans adds maybe 10-15 calories but fills a meaningful chunk of the bowl.
Exercise: how much is enough?
Diet alone will help your dog lose weight, but combining it with exercise accelerates the process and protects muscle mass. The protein vs fat content of food matters here too, but activity is the other half of the equation.
The recommendation from the PDSA is at least 30 minutes of exercise per day for adult dogs, rising to 2 hours or more for active breeds. But if your dog is significantly overweight, start gently. Extra weight puts strain on joints, and overdoing exercise on sore joints leads to injury and a dog that can’t exercise at all.
Start with 15-20 minute walks on flat ground, twice a day. Build up gradually over 4-6 weeks. Add hills, longer distances, and more intensity as your dog’s fitness improves and their weight comes down.
Swimming is brilliant for overweight dogs because it exercises the whole body without putting stress on joints. If you have access to safe water (or a canine hydrotherapy pool near you), even a 10-minute swim session burns serious calories.
Play counts too. Fetch, tug, and chase games in the garden or park burn calories and build the bond between you and your dog. Some dogs will exercise more enthusiastically in play than they will on a lead walk.
How fast should your dog lose weight?
Aim for 1-2% of body weight per week. For a 25kg dog that needs to lose 5kg, that means roughly 0.25-0.5kg per week. The whole process should take 10-20 weeks.
Faster weight loss is risky. Losing weight too quickly can cause hepatic lipidosis (fatty liver disease), muscle wasting, and nutritional deficiencies. Crash diets don’t work for dogs any better than they work for humans. Slow and steady gets you there safely.
Weigh your dog weekly (same scales, same time of day, preferably before feeding) and track the numbers. If you’re losing 1-2% per week, you’re on track. If you’re losing more, add a little more food. If you’re not losing anything after 2-3 weeks, check your portion sizes again and make sure no one in the household is sneaking treats.
Common mistakes that sabotage weight loss
Feeding the whole household. One person puts food down, another adds a bit more, someone else gives treats, and the kids share their dinner. Everyone thinks someone else is counting calories. Result: the dog is getting 50% more food than anyone realises. If your dog needs to lose weight, everyone in the house needs to be on the same page.
“He looks hungry.” Your dog will always look hungry. Dogs are hardwired to eat whenever food is available. That pleading expression doesn’t mean they’re starving. It means they’re a dog. Stay strong and stick to the portion.
Switching to a “light” food but feeding the same amount. Light foods have fewer calories per gram, so feeding the same volume as standard food is actually a calorie reduction. But some owners compensate by feeding more because the dog seems hungrier on the new food. If you do that, you’ve defeated the purpose of buying light food.
Assuming exercise alone will fix it. A 30-minute walk burns maybe 100-150 calories for a medium dog. That’s one Bonio. Exercise is important for overall health and fitness, but weight loss is primarily driven by what goes in the bowl.
Inconsistent weighing. If you don’t weigh your dog regularly, you’re guessing at whether the diet is working. Buy a cheap pet scales, or weigh yourself, then weigh yourself holding your dog and subtract the difference. Weekly tracking keeps you honest.
When to see the vet
If your dog is only slightly overweight (BCS 6 out of 9), dietary management at home is usually fine. But if your dog is significantly overweight (BCS 7-9), has other health conditions, or isn’t losing weight despite proper portion control for 4-6 weeks, book a vet appointment.
Some medical conditions cause weight gain or make weight loss difficult. Hypothyroidism (underactive thyroid) is common in dogs and slows metabolism. Cushing’s disease (excess cortisol) causes weight gain and muscle loss. Both are treatable with medication, but they need to be diagnosed first.
Your vet can also rule out joint pain that might be limiting your dog’s ability to exercise, and they may recommend a specific prescription weight management diet if the budget options aren’t working. Prescription diets are more expensive, but if your dog has underlying health issues complicating weight loss, they might be necessary.
The dog food guide for every budget
Weight management is one piece of the puzzle. Choosing the right food for your dog’s overall needs requires looking at the bigger picture: life stage, activity level, health conditions, and budget. Our complete guide covers all of that, with specific recommendations at every price point.
Honest verdict
You don’t need to spend a fortune on prescription diet food to help your dog lose weight. Harringtons Light, Skinners Lightweight, Burns Weight Control, and Wagg Weight Control all deliver proper weight management nutrition at budget-friendly prices. Wagg is the cheapest, Harringtons offers the best balance of price and protein, Skinners suits active dogs, and Burns is the pick for dogs with sensitive digestion.
The food matters, but it’s not the whole answer. Weigh every portion. Cut the treats. Count every calorie that goes into your dog’s mouth. Exercise gently and consistently. Track progress weekly. Be patient. Your dog didn’t get overweight in a week, and they won’t get thin in a week either.
Most dogs will reach a healthy weight within 3-5 months of consistent dietary management. The difference in their energy levels, mobility, and overall happiness once the extra weight comes off is dramatic. And it might add years to their life. That’s worth a bit of portion discipline and a kitchen scales.
FAQs
Can I just feed my dog less of their normal food instead of buying weight management food?
Technically yes, and it will work if you’re strict about portions. But your dog will feel hungrier because they’re getting less bulk. Weight management foods are lower in calorie density, so your dog can eat a larger volume of food for fewer calories. They feel more satisfied even though they’re taking in less energy. It’s easier for both of you.
How long does it take for a dog to lose weight?
A safe rate is 1-2% of body weight per week. For a dog that needs to lose 5kg, expect the process to take 3-5 months. Faster weight loss is dangerous and can cause serious health problems including liver disease. Slow and consistent is the way to go.
Are light dog foods less nutritious than regular dog food?
No. Light foods meet the same FEDIAF nutritional standards as regular complete foods. They have lower fat and calorie content, but the protein, vitamin, and mineral levels meet or exceed minimum requirements. Your dog gets complete nutrition, just with fewer calories per serving.
My dog always seems hungry. How do I know if they’re actually starving or just begging?
If you’re feeding the recommended portion of a complete weight management food, your dog is not starving. Dogs beg because they’re opportunistic feeders, not because they need food. It feels mean to ignore them, but giving in is the worst thing you can do for their long-term health. Try adding green beans or carrots to their bowl for extra bulk without extra calories.
What’s the cheapest way to help my dog lose weight?
Buy a budget light food (Wagg Weight Control starts around £1.50/kg), weigh every portion with kitchen scales, cut out all treats and table scraps, and walk your dog for 30 minutes twice a day. That combination will cost you roughly 40-70p per day in food and will work for the vast majority of overweight dogs. No expensive supplements, no prescription diets, no specialist consultations needed.
Using the 10% treat rule properly
Vets and pet nutritionists consistently recommend that treats should make up no more than 10% of your dog’s daily calorie intake. This sounds simple, but in practice most owners dramatically underestimate how many calories their dog gets from treats and extras.
Let’s break down what 10% actually means. For a 20kg dog needing 1200 kcal per day for weight loss, 10% is 120 calories. That’s roughly one and a half Bonio biscuits. One small Dentastix. Two or three small training treats. Half a pig’s ear. It is not very much at all.
Now think about how many treats your dog actually gets in a day. A couple of biscuits in the morning. A chew after their walk. A training treat for recalling. A bit of cheese when you’re cooking. Some leftovers from the kids’ plates. Before you know it, you’ve added 300-400 calories of treats on top of their regular food. That’s 25-30% of their daily intake, and it entirely wipes out the calorie deficit you need for weight loss.
The simplest approach is to measure out your dog’s full daily food ration first thing in the morning, put it in a container, and take treats from that container throughout the day. If the container is empty by bedtime, that’s it. No more food. This guarantees you’re not exceeding the daily calorie target regardless of how many treats you hand out.
Medical conditions that make weight loss harder
If your dog is eating the right amount of light food, getting regular exercise, and still not losing weight after 6-8 weeks, there might be an underlying medical issue. Two conditions are particularly common.
Hypothyroidism is an underactive thyroid gland. The thyroid controls metabolism, and when it’s underactive, the body burns fewer calories. Dogs with hypothyroidism typically gain weight despite eating normal or reduced amounts, and they may also show signs like lethargy, a dull coat, and skin problems. It’s diagnosed with a blood test and treated with daily thyroid medication. Most dogs respond well and start losing weight within a few weeks of starting treatment.
Cushing’s disease (hyperadrenocorticism) causes the body to produce excess cortisol, which promotes fat storage and muscle loss. Dogs with Cushing’s develop a pot-bellied appearance, drink and urinate more than usual, and may have thinning skin. It’s diagnosed through blood tests and sometimes imaging, and treatment options include medication and in some cases surgery.
Both conditions are more common in middle-aged and older dogs. If your dog is over 7 and struggling to lose weight despite your best efforts, a vet visit is a sensible next step. Don’t assume it’s just greed or lack of willpower.
Tracking progress: a simple system
You don’t need fancy equipment or apps to track your dog’s weight loss. A cheap kitchen scales, a notebook, and 5 minutes per week is all it takes.
Weigh your dog at the same time each week, ideally before their first meal on the same day. Use the same scales. If you don’t have pet scales, weigh yourself holding the dog and subtract your own weight. Write down the number. That’s it.
Plot the numbers on a simple chart or just keep them in a list. What you’re looking for is a downward trend, not a straight line. Some weeks your dog might lose 200g, others 100g, and occasionally they might stay the same or gain slightly (water retention, full bladder, seasonal coat changes can all cause small fluctuations). As long as the general direction is down over 3-4 weeks, you’re making progress.
Take a photo from the side every 2 weeks. Visual progress is often more motivating than the numbers on the scales, and you’ll be able to see the waist definition improving even when the scales seem stuck.