Over Half of UK Dogs Are Overweight: How to Prevent and Manage Obesity in Dog

Weight gain in dogs usually happens gradually.

A slightly larger food portion, a few extra treats, less exercise during bad weather or a change in age and mobility may not seem significant on their own. Over several months, however, they can make a noticeable difference.

This is not about blaming owners or making dogs look thin.

It is about recognising when additional weight may be affecting your dog’s comfort, movement and long-term health, then making safe and realistic changes.

The scales provide useful information, but they do not tell the whole story. Your dog’s body shape, muscle condition, breed, age, health and build also matter.

If you think your dog may be overweight, speak to your vet before introducing a strict diet or a demanding exercise programme.

The quick answer

Your dog may be overweight if:

• their ribs are difficult to feel
• their waist is no longer visible from above
• their abdomen does not tuck upwards behind the ribs
• fat has collected around the neck, shoulders or base of the tail
• they are slower or less willing to exercise
• they tire more quickly than before
• their harness or collar has become tighter
• their weight has increased during routine veterinary checks

An ideal body shape usually includes ribs that can be felt easily beneath a light covering of fat, a visible waist when viewed from above and an abdominal tuck when viewed from the side.

The PDSA Body Condition Score guide and the WSAVA Body Condition Score chart provide useful visual guides.

Why a healthy weight matters

Carrying excess body fat can make ordinary movement harder.

It can also place additional strain on joints, breathing and general mobility. Obesity is associated with poorer quality of life, shorter lifespan and an increased risk of several health problems.

The Royal Veterinary College has linked excess weight in dogs with conditions including arthritis, breathing difficulties, diabetes and heart disease.

You may notice changes such as:

• reluctance to climb stairs
• difficulty getting into a car
• reduced interest in play
• heavier panting
• shorter or slower walks
• stiffness after resting
• difficulty grooming or reaching parts of the body
• reduced tolerance of warm weather
• less enthusiasm for activities they previously enjoyed

These signs can also be caused by pain, illness or ageing.

Do not assume that every slowing dog simply needs to lose weight. A veterinary examination may be needed to understand what is happening.

How to check your dog’s body condition

Choose a time when your dog is relaxed and comfortable being touched.

Do not press firmly into painful or sensitive areas.

Feel the ribs

Place your hands gently over both sides of your dog’s ribcage.

You should normally be able to feel the ribs beneath a light covering of tissue without pressing hard.

If you cannot feel them without applying significant pressure, your dog may be carrying excess fat.

Visible ribs are normal in some naturally lean breeds, including some sighthounds. Breed, build and muscle condition should always be considered.

Look from above

Stand above your dog and look down their body.

An ideal shape usually includes a visible waist behind the ribcage.

A dog who appears almost the same width from shoulders to hips may be overweight, although coat type can make this difficult to judge visually.

Use your hands as well as your eyes.

Look from the side

Viewed from the side, the abdomen should normally rise behind the ribcage.

This is known as the abdominal tuck.

A flat or sagging outline does not automatically prove that a dog is overweight. Age, pregnancy, body shape, muscle loss and medical conditions may affect appearance.

Check the spine, hips and tail base

Run your hands gently along your dog’s back and around the base of their tail.

You should be able to feel the underlying structure without the bones being extremely prominent.

A noticeable pad of fat around the tail base, lower back or hips can indicate excess body fat.

PDSA recommends assessing the ribs, waist, abdomen, spine, hips and tail base rather than relying only on a number from the scales

Understanding the nine-point Body Condition Score

Veterinary professionals commonly use a nine-point Body Condition Score, often shortened to BCS.

The WSAVA dog Body Condition Score chart broadly describes dogs as:

• 1 to 3: below ideal condition
• 4 to 5: ideal condition
• 6 to 7: above ideal condition
• 8 to 9: significantly above ideal condition

A score of five does not mean that every ideal dog should look identical.

A heavily coated dog, a muscular working breed and a naturally lean sighthound may appear very different while all being healthy.

Body Condition Score should also be considered alongside muscle condition. An older dog can carry excess fat while simultaneously losing muscle.

The British Small Animal Veterinary Association recommends regular weight and body-condition monitoring throughout a dog’s life.

Why the scales do not tell the whole story

A Labrador, Whippet and Border Terrier should not be judged against the same visual shape or target weight.

Even two dogs of the same breed may differ because of:

• height
• bone structure
• sex
• muscle mass
• age
• neuter status
• medical history
• activity level

Your dog’s previous healthy adult weight may provide a useful reference, but it should not be treated as an unquestionable target.

A dog may also lose weight without improving their health if too much muscle is lost.

This is one reason a veterinary weight-management plan should consider:

• body weight
• Body Condition Score
• muscle condition
• diet
• treats and extras
• exercise
• pain and mobility
• relevant medical conditions

How dogs gradually gain excess weight

Weight gain often results from several small factors rather than one obvious mistake.

These may include:

• portions that are larger than the dog needs
• measuring food by eye
• several family members giving treats
• table scraps
• high-calorie chews
• using treats during training without reducing meals
• reduced activity after illness or injury
• reduced exercise during winter
• age-related changes
• increased appetite
• changes after neutering
• moving from an active job or lifestyle to a quieter one
• feeding the same amount despite lower activity
• food being available throughout the day
• taking food from another pet’s bowl

Neutering does not inevitably make a dog overweight, but hormonal changes can affect appetite and energy requirements. Your vet may recommend reviewing food portions following neutering. (PDSA)

When weight gain needs a veterinary check

Arrange veterinary advice when weight gain is:

• sudden
• unexplained
• continuing despite measured portions
• accompanied by increased thirst
• accompanied by coat or skin changes
• associated with lethargy
• linked to a new medication
• accompanied by a swollen abdomen
• occurring alongside breathing problems
• affecting mobility
• happening in an older dog
• occurring despite reduced appetite

Conditions such as hypothyroidism and Cushing’s disease can contribute to weight gain, although an imbalance between food intake and energy use is more common. Certain medications can also affect appetite and weight. (PDSA)

Your vet may recommend:

• a physical examination
• accurate weighing
• Body Condition Scoring
• blood or urine tests
• a review of medication
• assessment of pain and mobility
• an individual target weight
• a suitable weight-management food
• regular progress checks

Start with an honest food record

Before changing your dog’s diet, record everything they consume over several ordinary days.

Include:

• breakfast
• dinner
• training treats
• dental chews
• food toys
• scraps from plates
• food given by children
• treats from visitors
• medication hidden in food
• chews
• leftovers from another pet
• scavenged food where known

Owners often measure the main meals carefully but overlook the extras.

A small biscuit may not appear significant, but several biscuits, pieces of cheese and a chew can add substantially to the day’s total intake.

Do not rely on memory. Write it down.

Measure meals accurately

Use kitchen scales to weigh each meal in grams.

Cups, scoops and handfuls can vary considerably depending on who fills them and how tightly the food is packed.

Keep a written record of:

• the food used
• the quantity fed
• the number of meals
• treats
• chews
• supplements
• food used during training

The feeding guide on the packet is a starting point rather than a personalised prescription.

Dogs of similar size may need different amounts because of their age, health, activity, metabolism and body condition.

Read How to Feed Adult Dogs Properly for more about portions, complete diets and safe feeding routines.

Do not simply reduce food by an arbitrary percentage

Avoid deciding that every overweight dog should automatically receive 10%, 15% or 20% less food.

A large reduction may leave the diet nutritionally unbalanced or cause excessive hunger and muscle loss.

Your vet may recommend:

• adjusting the existing food
• changing to a complete weight-management diet
• altering meal frequency
• using part of the daily food for training
• setting an individual calorie allowance
• monitoring weight and body condition regularly

The BSAVA notes that more severe food restriction can increase the amount of muscle lost during weight reduction. Its guidance recommends prioritising health and wellbeing rather than chasing the fastest possible result.

Treats still count

Treats are not nutritionally invisible simply because they are used during training.

This includes:

• biscuits
• cheese
• cooked meat
• shop-bought training treats
• dental chews
• dried fish
• peanut butter
• food placed in enrichment toys
• table scraps

You do not necessarily need to stop rewarding your dog.

Instead, consider:

• using part of their measured daily food allowance
• cutting treats into much smaller pieces
• choosing lower-calorie rewards approved for your dog
• rewarding with sniffing, play or access to an activity
• avoiding automatic treats every time you enter the kitchen
• keeping high-value food for difficult situations
• making sure everyone in the household follows the same plan

The BSAVA recommends incorporating treats and other extras into the dog’s total daily food requirement.

Use rewards your dog values

A reward does not need to be large.

Most dogs respond to the number and timing of rewards more than the physical size of each piece.

A small treat can still reinforce:

• returning when called
• walking with a loose lead
• moving away from rubbish
• calmly passing another dog
• settling on a mat
• allowing equipment to be fitted

Other rewards may include:

• being allowed to sniff
• continuing the walk
• a favourite toy
• gentle praise
• moving away from something worrying
• access to the garden
• a short game

Reducing unnecessary calories does not mean making training less rewarding.

Be careful with homemade treats

Homemade treats can be useful because you control the ingredients and portion size.

However, homemade does not automatically mean low-calorie or nutritionally suitable.

Ingredients such as cheese, liver, peanut butter and fatty meat can still add significant calories.

Any homemade treat should be:

• safe for dogs
• plain and unseasoned
• prepared hygienically
• cut into small portions
• included in the daily food calculation
• suitable for your individual dog

Never add garlic, onion, chives or leeks to dog treats. These all belong to the allium family and can be toxic to dogs, including when cooked or dried.

Safe exercise for an overweight dog

Exercise supports physical health, mobility and mental wellbeing, but more is not always better.

An overweight dog who is unfit, arthritic or struggling to breathe should not suddenly be taken on long runs or demanding hikes.

Begin at a level your dog can manage comfortably.

Depending on veterinary advice, this might involve:

• several shorter walks
• a slower pace
• gentle pavement routes
• controlled lead walking
• additional sniffing
• low-impact games
• brief reward-based training
• appropriate hydrotherapy arranged through a professional
• gradual increases in duration

Monitor how your dog moves:

• during the activity
• immediately afterwards
• later that evening
• the following morning

A dog who appears enthusiastic during a walk may still be stiff or uncomfortable afterwards.

My Dog Walking and Everyday Exercise Guide explains how age, breed, health, weather, fitness and temperament affect suitable activity.

Increase activity gradually

Change one part of the routine at a time.

You might begin by:

• adding five calm minutes to one walk
• introducing another brief toilet and sniffing outing
• replacing one stationary treat activity with a gentle food search
• encouraging relaxed movement around the garden
• using part of a meal during low-impact training
• choosing a flatter route

Do not increase distance, speed, hills, and play intensity all at once.

Watch for:

• limping
• slowing down
• repeated stopping
• reluctance to continue
• excessive panting
• coughing
• stiffness
• difficulty rising
• licking joints or paws
• reduced activity the following day

Stop and seek veterinary advice if your dog develops collapse, severe breathing difficulty, sudden pain or a significant mobility change.

Sniffing still has value

A weight-management walk does not need to be a forced march.

Allowing your dog time to sniff can provide mental activity while keeping movement calm and manageable.

A dog may cover less distance on a sniff-focused walk, but they are still:

• moving
• exploring
• processing scent
• making choices
• engaging with their environment

For some older, nervous or unfit dogs, a calm and consistent routine is more sustainable than repeatedly pushing them to walk further.

Avoid relying only on high-intensity exercise

Repeated ball throwing, fast running and highly arousing games may appear to burn calories quickly, but they can also place strain on joints and encourage abrupt stops and turns.

This may be particularly unsuitable for dogs who are:

• unfit
• overweight
• arthritic
• recovering from injury
• elderly
• growing
• flat-faced
• prone to joint problems

Exercise should improve wellbeing rather than leave the dog sore, exhausted or unable to settle.

Weight loss for senior dogs

Older dogs often experience changes in:

• muscle mass
• mobility
• appetite
• metabolism
• sleep
• digestion
• dental health
• medical needs

An older dog may need fewer calories than before, but simply feeding less may not provide the best balance of nutrients.

They may need:

• a veterinary health check
• pain assessment
• a diet appropriate to their life stage
• careful protein and calorie planning
• gentler exercise
• more frequent, shorter outings
• non-slip flooring
• regular weight and muscle monitoring

Read Senior Dog Nutrition Tips for more about adapting feeding as dogs age.

Overweight dogs with arthritis or mobility problems

Pain can create a difficult cycle.

The dog moves less because movement hurts. Reduced activity contributes to further weight gain. Additional weight then makes movement more difficult.

Do not try to break this cycle by forcing longer walks.

Speak to your vet about:

• pain relief
• mobility assessment
• an appropriate food plan
• controlled exercise
• physiotherapy
• hydrotherapy
• safe home adjustments
• a realistic target weight

Activities may need to focus on comfortable, repeated movement rather than distance.

Flat-faced dogs need particular care

Flat-faced breeds may struggle with breathing and temperature regulation.

Excess weight can add to those difficulties.

Avoid:

• exercising in warm or humid conditions
• sudden high-intensity activity
• encouraging prolonged running
• waiting for severe panting before stopping

Choose cooler times, shorter routes and activities suited to the dog’s veterinary and physical needs.

Do not use exercise to compensate for unlimited food

It is difficult to walk off repeated high-calorie extras.

Food intake and activity should be considered together.

A dog may become fitter while remaining overweight if their daily calorie intake continues to exceed what they use.

Equally, severely restricting food without supporting safe movement may increase hunger and muscle loss.

The aim is a balanced plan that your dog and household can maintain.

Make sure the whole household follows the plan

Weight management becomes difficult when one person measures meals but several others provide extras.

Agree:

• who feeds each meal
• the exact daily quantity
• where treats are stored
• how many treats are available
• whether food is used during walks
• what visitors may give
• what children may offer
• what happens when medication requires food

One practical option is to place the whole day’s allowance in a labelled container each morning.

Meals, training rewards and enrichment food all come from that allowance unless your vet has advised otherwise.

When the container is empty, the day’s allowance has been used.

Monitor progress without becoming obsessed with the scales

Your vet may recommend regular weigh-ins.

Also record:

• Body Condition Score
• waist measurement where advised
• harness fit
• walking duration
• mobility
• breathing
• ability to climb steps
• willingness to play
• recovery after exercise
• photographs from above and the side

Take photographs in the same location and position where possible.

Gradual changes are easier to recognise when you compare records over time.

Do not weigh your dog repeatedly at home and react to every small fluctuation. Hydration, meals, toileting and differences between scales can affect the result.

Follow the monitoring interval agreed with your veterinary practice.

What if your dog constantly appears hungry?

Some dogs become more interested in food when portions change.

Helpful strategies may include:

• dividing the daily allowance into more meals
• using part of the ration in a simple food toy
• scatter-feeding where safe
• adding suitable low-calorie foods only with veterinary approval
• providing calm sniffing activities
• moving food out of sight
• stopping family members from feeding at the table
• keeping mealtimes predictable

Constant hunger can also have medical or nutritional causes.

Speak to your vet if your dog appears unusually hungry, loses weight despite eating, scavenges obsessively or shows other changes.

Common weight-loss mistakes

Cutting food suddenly

A dramatic reduction may leave your dog hungry and risk an unbalanced intake or muscle loss.

Follow a veterinary plan.

Guessing portions

Small daily measuring errors add up.

Use kitchen scales.

Ignoring treats and chews

Everything your dog eats contributes to the total.

Increasing exercise too quickly

An unfit or painful dog can be injured by a sudden demanding programme.

Focusing only on the target weight

Comfort, mobility, muscle and body condition are also important.

Assuming the dog is lazy

Reduced movement may be linked to pain, breathing problems, fear or illness.

Punishing scavenging

Hunger and established scavenging habits need careful management and reward-based training, not intimidation.

Expecting rapid results

Sustainable progress is usually gradual.

The fastest possible weight loss is not necessarily the safest.

How a dog walker may help

A dog walker cannot prescribe a diet or diagnose obesity.

However, a suitable walking routine may support a plan agreed with your vet.

I can help by providing:

• consistent one-to-one walks
• calm movement at an appropriate pace
• shorter walks where needed
• sniffing and low-impact enrichment
• feedback about mobility and stamina
• avoidance of unsuitable group exercise
• reinforcement of agreed reward-based routines

I do not use vans or group collection rounds. Walks start and finish at your dog’s home, making it easier to adapt the route around the individual dog.

Read about my solo dog walks in Finchley and Muswell Hill.

Your vet should decide whether increased exercise is appropriate where your dog has obesity, arthritis, breathing problems, heart disease or another medical concern.

Related guides

You may also find these useful:

• How to Feed Adult Dogs Properly
• Dog Walking and Everyday Exercise Guide
• Senior Dog Nutrition Tips
• Solo Dog Walks in Finchley
• Dog Health and First Aid Guide

Frequently asked questions

How can I tell whether my dog is overweight?

Check whether you can feel their ribs easily, see a waist from above and see an abdominal tuck from the side. A Body Condition Score provides a more useful assessment than weight alone.

What Body Condition Score should my dog have?

On the standard nine-point scale, scores of four or five are generally considered ideal. Your vet should consider your dog’s breed, build, muscle and health when assessing them.

Should I feed my dog less if they are overweight?

Possibly, but do not make a large arbitrary reduction. Ask your vet to review the type and amount of food, treats, health and target weight.

Can I help my dog lose weight by walking them more?

Safe additional activity may help, but it must suit your dog’s fitness, mobility, breathing and health. Increase exercise gradually and seek veterinary advice when your dog is significantly overweight or has a medical condition.

Are treats allowed during weight loss?

They may be, but they must be included within the total daily intake. Use small pieces, as part of the normal food ration, or as non-food rewards where suitable.

Are carrots good treats for an overweight dog?

Small pieces of a dog-safe vegetable may suit some dogs, but they still need to be included in the overall diet. Check with your vet if your dog has a medical condition, digestive issue or prescribed diet.

How quickly should my dog lose weight?

There is no single safe rate for every dog. Your vet should set and monitor an individual plan that protects muscle and general health.

Why is my dog gaining weight despite eating the same amount?

Their energy needs may have changed because of age, reduced activity, neutering, illness or medication. Treats and other extras may also contribute. Arrange veterinary advice when the gain is unexpected.

Can an older dog safely lose weight?

Yes, but older dogs require careful assessment because they may also have muscle loss, pain or medical problems. A veterinary plan can balance calorie control, nutrition and suitable movement.

Is obesity a disease in dogs?

Veterinary organisations recognise that obesity can directly impair health and welfare. The BSAVA describes clinical obesity as a disease where excess body fat is itself causing illness or impaired function. (BSAVA)

A final thought

Weight gain is easy to miss when you see your dog every day.

Their coat may hide changes. Portions may slowly become larger. Walks may gradually become shorter. A biscuit here and a little cheese there may become part of the routine.

Recognising that your dog is overweight is not an admission that you have failed them.

It is an opportunity to make their everyday life more comfortable.

Start with an honest assessment.

Speak to your vet.

Measure food accurately.

Count the extras.

Build exercise gradually.

Then monitor how your dog feels and moves, not just the number displayed on the scales.

About Del Chambers

I established Finchley Dog Walker in 2011 and provide calm, one-to-one dog walking and home pet care in Finchley, Muswell Hill and selected nearby parts of North London.

My walks are adapted around the individual dog rather than using a fixed group routine.

This is particularly useful for older dogs, rescue dogs and dogs whose mobility, health or confidence means they benefit from a slower and more personal approach.

I am not a veterinary surgeon or canine nutritionist. Information on this page is for general guidance and does not replace advice from your veterinary practice.

To discuss suitable one-to-one walks, use the Finchley Dog Walker contact page.

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