Pet Obesity in the UK: Signs, Risks and How to Help Your Pet Lose Weight

Roughly half the dogs and cats in Britain are carrying too much weight, and the awkward truth is that most of their owners have no idea. It creeps on slowly, a few extra treats here and a topped-up bowl there, until a slightly rounder dog just looks normal to the person feeding it. This is a plain, practical look at how big the problem really is, how to tell if your own pet is overweight, and exactly how to help them lose it safely.

How common is pet obesity in the UK?

The numbers depend a lot on who's counting. When the PDSA asks vets, the picture is stark: veterinary professionals estimate that around 46% of dogs and 43% of cats they see are overweight or obese. Obesity has been named as one of the top five welfare concerns for dogs, cats and rabbits in every PAW Report since the survey began in 2011.

What's recorded in clinical notes tells a different story. The Royal Veterinary College's VetCompass study of 22,333 dogs found overweight status formally logged in just 7.1% of records — about one dog in 14. That gap between what vets see and what gets written down matters: it means obesity is badly under-recorded, so plenty of overweight pets are never flagged for action at all.

The biggest blind spot, though, is at home. Across successive PAW Reports, roughly eight in ten owners have described their pet as an ideal weight — a figure that simply can't be true if half of pets are overweight. In one survey, 82% of owners didn't know their pet's body condition score. When PDSA asked what was stopping their pet slimming down, the most common answer by far was "my pet doesn't need to lose weight" (chosen by 48% of dog owners and 49% of cat owners).

The single most useful thing you can do isn't a diet. It's learning to look at your pet honestly. Recognising the problem is the step almost everyone skips.

Why a few extra pounds matters

Carrying excess fat isn't a cosmetic issue — it shortens and worsens lives. Overweight pets are more likely to develop:

• Osteoarthritis and joint pain — extra load on hips, elbows and knees, often years earlier than it should appear
• Diabetes, especially in cats
• Heart and breathing problems, made worse in flat-faced breeds
• Reduced heat tolerance — heavier pets overheat faster in a UK summer
• A higher anaesthetic and surgical risk, plus some cancers
• A shorter life overall — and less of the comfortable, active life they do have

Worryingly, PDSA found only 69% of owners agreed that overweight pets are more likely to suffer serious disease, and just 65% agreed they're likely to live shorter lives. Owners whose pet wasn't registered with a vet were far less likely to know this — which is exactly why a yearly check-up earns its keep.

How to tell if your pet is overweight: body condition scoring

Forget the bathroom scales as a starting point — a "normal" weight for one Labrador is very different from another. Vets use body condition scoring (BCS), usually a 9-point scale where 4–5 is ideal. It takes about a minute, and you can do it at home with your hands.

The three checks (dogs and cats)

| What to check | How to do it | Ideal weight | Overweight | |---|---|---|---| | Ribs | Run your hands along the side of the chest | Ribs easily felt under a thin layer of fat, like the back of your hand | Ribs hard to feel; a thick padding over them | | Waist (from above) | Look down at your standing pet | A clear waist that tucks in behind the ribs | Straight-sided or bulging outwards — no waist | | Tummy (from the side) | Look at the profile | Belly tucks up towards the back legs | Belly hangs level or sags down |

The rule of thumb vets repeat: you should be able to feel the ribs easily but not see them. If you have to press to find them, your pet is likely overweight. If they stick out visibly, they may be underweight. PDSA's free Weigh Up tool has clear picture guides for both dogs and cats. Do the check once a fortnight — your hands will spot a change long before the difference is obvious to your eyes.

Why pets gain weight

It's rarely one big thing. It's usually several small ones stacking up:

• Too much food, measured by eye. A scoop and a "handful" are wildly inconsistent. Getting portions wrong by 10–15% every day adds up over months.
• Treats — the hidden calories. A couple of dog biscuits and a slice of cheese can quietly be a fifth of a small dog's daily calories. PDSA's owners were candid: 29% give in when their pet begs, and 15% said feeding treats is how they show love.
• Neutering. Neutered pets need noticeably fewer calories. In the RVC study, neutered male dogs had almost double the overweight risk of entire females — usually because feeding wasn't adjusted afterwards.
• Age. Middle age is the danger zone. RVC found dogs aged six to nine had nearly three times the overweight risk of dogs under three.
• Breed. Some breeds are simply built to pile it on. Vets should feed these dogs as "prone to weight gain" from the start.

Dog breeds at higher risk (RVC VetCompass)

| Breed | Overweight risk vs. crossbreeds | |---|---| | Pug | 3.1x | | Beagle | 2.7x | | Golden Retriever | 2.6x | | English Springer Spaniel | 2.0x | | Border Terrier | 1.7x | | Labrador Retriever | 1.7x | | Cavalier King Charles Spaniel | 1.5x | | Cocker Spaniel | 1.3x |

If you share your home with a Labrador, our guide on feeding a Labrador and avoiding obesity goes deeper on the genetic appetite quirk behind that number.

A practical weight-loss plan for dogs

Go slow. Safe canine weight loss is roughly 1–2% of body weight a week — a marathon, not a sprint. Crash-dieting a dog is miserable and counterproductive.

1. Start with a vet or vet nurse check. Free weight clinics are common. They'll rule out medical causes like an underactive thyroid, set a realistic target weight, and calculate the calories to get there. Feeding "a bit less" without a target usually stalls. 2. Keep a three-day food diary first. Write down every single thing that goes in — meals, treats, training rewards, the crust off the toast. Most owners are genuinely surprised. This is where the easy wins hide. 3. Weigh the food, don't scoop it. Use kitchen scales and follow the calorie target, not the optimistic guide on the bag (those assume an active, entire adult). For stubborn cases, a prescription weight-loss diet keeps your dog fuller on fewer calories — ask your vet. 4. Budget for treats — 10% of daily calories, maximum. Then subtract them from meals. Swap biscuits for carrot batons, green beans or a few pieces of their own kibble counted out at breakfast. 5. Slow the eating down. A slow feeder bowl or scattering kibble in a snuffle mat turns a 20-second gulp into 10 minutes of foraging, which feels far more satisfying for the same food. 6. Build activity gradually. Two walks a day beats one long slog. Add gentle play, and go easy on older or very heavy dogs — little and often, and never in the heat. 7. Weigh-in every two to four weeks and keep a note. Adjust with your vet if the numbers stall.

For older dogs whose metabolism and activity have both dropped, our senior dog feeding guide covers how to trim calories without cutting the protein they still need.

A practical weight-loss plan for cats

Cats need extra care, because of one serious risk. Never crash-diet a cat or let an overweight cat suddenly stop eating. Rapid weight loss or starvation can trigger *hepatic lipidosis* — a dangerous, potentially fatal fatty-liver disease. Slow and steady is not optional here; it's a safety rule.

1. Get a vet plan. They'll set a gentle target — reaching an ideal weight can take six months to a year for a very overweight cat, and that's completely normal. 2. Switch to measured, scheduled meals. Free-feeding a bowl that's topped up all day is the classic cause. Measure the daily ration and split it into set meals. 3. Make them work for it. Put food in a puzzle feeder or scatter it so your cat has to hunt for each piece — this mimics natural behaviour and burns energy. Short, daily play sessions with a wand toy do more than you'd think. 4. Cut the extras. Milk, cheese and cat treats are calorie-dense. If your cat expects a treat, count it into the daily total. 5. Handle multi-cat homes carefully. Feed the dieting cat separately — in another room if needed — and remove any uneaten food so they can't graze off a housemate's bowl. Our multi-cat feeding solutions guide covers microchip feeders and layout tricks that stop food-stealing.

For portion maths specific to cats, see our guide on cat portion control and obesity.

Common mistakes that stall weight loss

• Forgetting treats count. The meals are perfect, but three people in the house each slip a biscuit. Agree a household treat rule.
• Feeding by the bag's guidance. Those figures run high and rarely match a neutered, less-active pet.
• Going too fast. Sudden severe cuts leave pets ravenous and, in cats, are genuinely dangerous.
• Not weighing progress. Without a fortnightly number you can't tell if the plan works. Guessing keeps you stuck.
• "He's always been a big lad." Normalising it is how obesity hides. Trust the rib check, not the habit.
• Stopping the moment they look better. Hold the new routine — the weight comes straight back otherwise.

When to see a vet

Book an appointment before starting if your pet is very overweight, older, or has any health condition, and always if weight has climbed for no obvious reason (sudden gain can signal thyroid or hormonal problems). Most UK practices run free nurse-led weight clinics with scales, target-setting and monthly weigh-ins — genuinely one of the best free resources going, and the difference between a plan that works and months of guesswork.

Getting the balance right from the very start is far easier than reversing it later. If you've a growing dog, our guide to how much to feed a puppy by age and weight helps you build good habits before excess weight ever becomes the problem.

Sources

• PDSA – Obesity in dogs
• PDSA – Obesity in cats
• PDSA – Your dog's Body Condition Score (Weigh Up)
• PDSA – Your cat's Body Condition Score (Weigh Up)
• PDSA PAW Report 2023 – Dogs
• RVC VetCompass – study reveals extent of UK dog obesity crisis
• Blue Cross – Obesity in dogs
• Cats Protection – Cat obesity
• International Cat Care – Obesity in cats
• Royal Kennel Club – Managing weight
• UK Pet Food – Obesity report released to tackle rising pet obesity

Sources - PDSA – Obesity in dogs - PDSA – Obesity in cats - PDSA – Your dog's Body Condition Score (Weigh Up) - PDSA – Your cat's Body Condition Score (Weigh Up) - PDSA PAW Report 2023 – Dogs - RVC VetCompass – study reveals extent of UK dog obesity crisis - Blue Cross – Obesity in dogs - Cats Protection – Cat obesity - International Cat Care – Obesity in cats - Royal Kennel Club – Managing weight - UK Pet Food – Obesity report released to tackle rising pet obesity