Updated July 2026

It can be surprisingly difficult to notice when your own dog gradually gains weight.

You see them every day. Their coat may hide their body shape, while photographs and breed examples sometimes make a rounded appearance seem normal.

An overweight dog is not evidence that their owner does not care.

Portions can slowly increase. Different family members may give treats without realising what others have offered. Exercise may reduce after an injury, during bad weather or as the dog grows older.

Medication and some medical conditions can also affect weight, appetite or activity.

The important step is to recognise that something may have changed and ask your veterinary team for practical help.

This guide explains how to assess your dog’s body condition, identify possible sources of extra calories and develop a safe, gradual weight-management plan.

For broader feeding advice, visit my Dog Food and Nutrition Hub.

The quick answer

Your dog may be overweight when:

their ribs are difficult to feel
their waist is difficult to see from above
their abdomen does not tuck upwards behind the ribs
fat has accumulated around the neck, shoulders, hips or tail base
their body shape has gradually become rounder
their weight has increased over several veterinary visits

Do not begin a strict diet or suddenly increase exercise without advice.

Arrange a veterinary or veterinary-nurse appointment to:

confirm your dog’s current body condition
check their weight
agree a suitable target
discuss their complete diet
consider medical or medication-related factors
decide how exercise should change
arrange regular progress checks

Body shape matters as well as the number shown on the scales.

PDSA and BSAVA recommend monitoring both bodyweight and body-condition score because dogs of the same weight can have very different amounts of body fat and muscle. (PDSA)

What does overweight mean?

A dog is overweight when they carry more body fat than is considered healthy for their individual body.

Veterinary professionals commonly use a nine-point body-condition score.

On this scale:

four or five generally represents an ideal body condition
six or seven indicates an overweight body condition
eight or nine represents obesity

BSAVA describes scores of six and seven as an overweight phenotype and scores of eight and nine as an obese phenotype.

Do not try to assign a precise score from one photograph.

Coat, posture, breed shape and muscle can make visual assessment difficult. Ask your vet or veterinary nurse to demonstrate how to assess your individual dog.

Obesity is a health and welfare condition

Obesity is not simply a cosmetic issue.

BSAVA recognises obesity as a disease that can affect both health and welfare. It recommends regular monitoring of bodyweight and body condition throughout an animal’s life.

Excess body fat is associated with problems including:

reduced mobility
osteoarthritis and joint discomfort
cruciate-ligament problems
breathing difficulties
poorer heat tolerance
back problems
urinary incontinence
reduced quality of life
shorter lifespan

Flat-faced dogs may be particularly affected because excess weight can add to existing breathing difficulties.

This does not mean that every slower or heavily panting dog is overweight.

Those signs may also be connected to pain, heat, heart disease, respiratory illness or another medical problem.

How to check your dog’s body condition

Stand your dog on a secure, non-slip surface.

Check them from:

above
the side
both sides with your hands

Do not rely only on what you can see.

Feel the ribs

Run your hands gently along your dog’s sides.

At an ideal body condition, you should normally be able to feel the ribs with a light touch without needing to press firmly.

They should not usually be prominently visible, although naturally lean breeds such as some sighthounds may look different.

When you need to press through a thick layer before feeling the ribs, your dog may be carrying excess fat.

PDSA advises that the skin should move freely over ribs that can be felt with a light touch.

Look for a waist from above

Stand above your dog and look down.

The body should normally narrow behind the ribcage rather than continuing in a straight or rounded line towards the hips.

A thick coat can hide this shape, so combine the visual check with gentle handling.

Look for an abdominal tuck

View your dog from the side.

The underside should usually rise behind the ribs rather than hanging at the same level along the whole body.

A deep-chested breed will look different from a compact dog, so compare your dog with their own healthy shape rather than another breed.

Check the spine, hips and tail base

You should generally be able to feel the spine and hip bones beneath the skin without them appearing sharply prominent.

There should not be a large accumulation of soft fat around the base of the tail.

PDSA includes the ribs, waist, abdomen, spine, hips and tail base in its nine-point body-condition assessment.

Body condition and muscle condition are different

An older or unwell dog can lose muscle while still carrying excess body fat.

This means a dog may appear to be a reasonable weight on the scales while having:

reduced muscle over the back or hindquarters
excess fat around the chest or abdomen
poorer strength
difficulty standing or walking

WSAVA distinguishes body-condition scoring, which estimates fat stores, from muscle-condition scoring, which assesses muscle loss.

This is another reason to involve your veterinary team rather than relying only on a target number.

Weigh your dog regularly

Bodyweight is useful for tracking change within the same dog.

Your vet may weigh them:

at routine health checks
during vaccination appointments
when medication is reviewed
at weight-management clinics

Small dogs may be weighed at home using suitable scales.

For a larger dog, your veterinary practice may allow brief weight checks between appointments.

Record:

date
weight
body-condition score
food changes
exercise changes
medication
relevant health changes

A gradual upward trend can be easier to address than a large gain discovered several years later.

BSAVA recommends regular weight and body-condition checks, with more frequent monitoring for dogs already at increased risk.

Do not rely on breed-average weight charts

Breed ranges can provide background information, but they do not establish the correct weight for every individual.

Dogs within one breed can differ in:

height
frame
muscle
sex
age
working type
body shape

Crossbreeds may not fit any standard range.

Your dog’s body condition, muscle condition, health and weight history are more useful than comparing them with a general online chart.

Why do dogs gain excess weight?

Weight generally increases when calorie intake repeatedly exceeds the energy the dog uses.

However, the reasons behind that imbalance can be complicated.

They may include:

portions being too large
treats and chews
table scraps
food used during training
reduced activity
injury or illness
ageing
changes after neutering
medication
several people feeding the same dog
differences between the dog’s needs and packet guidance
an underlying medical condition

The solution should address the real cause rather than simply blaming the dog or owner.

Packet feeding guides are only a starting point

The amount printed on a food packet cannot account perfectly for every dog.

Individual requirements can vary according to:

age
body condition
size
activity
neuter status
health
calorie density of the food
treats and extras

UK Pet Food explains that feeding guidelines are a starting point and that portions should be adjusted according to the animal’s body condition and weight trend. (UK Pet Food)

Do not continue increasing the portion simply because your dog appears hungry.

Equally, do not make a large reduction without checking that the complete diet still supplies enough essential nutrients.

Measure food in grams

Cups, mugs, handfuls and scoops can produce different portions each day.

A scoop filled level and one filled generously may look similar while containing substantially different amounts.

Use digital kitchen scales where practical.

Record the total daily amount rather than only the amount placed in one bowl.

Include:

breakfast
evening food
food used for training
food toys
toppers
chews
dental products
food needed for medication

UK Pet Food notes that measuring by volume or estimating portions is prone to error.

Keep a seven-day food diary

Write down everything your dog eats for one ordinary week.

Include:

measured meals
treats
pieces of human food
chews
dental treats
food offered by visitors
food found while scavenging
leftovers
food used in puzzles
food provided during walks
medication hidden inside food

Do not change the routine during the diary simply to make it look better.

The aim is to identify where calories may be entering the day unnoticed.

A diary may reveal that the main meal is reasonable but several small extras have accumulated around it.

Everyone in the household needs the same plan

Weight-management plans often fail when one person measures meals while someone else gives additional snacks.

Agree:

who feeds each meal
the total daily portion
which treats are permitted
how treats will be recorded
whether visitors may feed the dog
what happens when the dog begs
how training rewards will be measured

Use a container containing the dog’s full daily treat allowance.

Once it is empty, no further food rewards should be added that day unless the veterinary plan says otherwise.

Treats still count as food

Treats can be helpful during:

training
recall practice
handling
veterinary preparation
calm walking
enrichment

They still contain calories.

PDSA recommends that treats make up no more than around 10% of a dog’s daily food allowance, with the main food adjusted to account for them.

This is a general upper guide rather than a target.

A dog on a weight-loss or medical diet may need a lower allowance or specific treats agreed with the veterinary team.

Use part of the normal meal for training

You may be able to set aside some of the measured daily food for:

rewarding calm behaviour
scent searches
food toys
recall practice
reinforcing lead skills

This reduces the need to add a separate stream of calories.

Check that the food remains suitable for the activity and does not become contaminated outdoors.

Dogs on wet, fresh, raw or veterinary diets may require another approach.

Treats do not have to be food

Depending on your dog, rewards can also include:

praise
gentle interaction
access to sniff
a favourite toy
a short game
moving towards something they enjoy
being released to explore
resting beside you

The reward should be something the dog genuinely values.

Do not remove food rewards from important training simply to reduce calories without considering how the behaviour will continue to be reinforced.

Instead, reduce the size, use part of the measured meal or ask your veterinary team and trainer for suitable alternatives.

Be careful with chews

A long-lasting chew may contain more calories than owners realise.

This can include:

dental chews
dried meat
ears
filled food toys
chew sticks
biscuits
natural chews

Ask the manufacturer for calorie information when it is not displayed.

Chews also need to be considered for:

dental safety
choking
swallowing
digestive conditions
allergies
resource guarding

Do not assume “natural” means low calorie or suitable for weight loss.

Human food can add up quickly

A small piece from a human plate may represent a significant amount for a small dog.

Common extras include:

cheese
toast
sausage
meat trimmings
biscuits
leftover roast dinner
milk
yoghurt
peanut butter

Some human foods are also toxic or unsuitable.

Do not reduce the complete dog food and replace it with an unbalanced collection of leftovers.

Read Dog Treats: Good or Bad? for more about portions and choosing rewards.

Medical conditions can affect weight

Diet and activity are the most common contributors to excess weight, but some medical conditions may be involved.

Possible examples include:

hypothyroidism
Cushing’s disease
mobility problems
pain
fluid retention
conditions that reduce activity

Other signs may include:

coat changes
low energy
increased thirst
increased urination
a changed abdomen
weakness
altered appetite

PDSA advises arranging a veterinary appointment when weight gain occurs alongside possible signs of illness.

Do not assume that cutting food will resolve unexplained weight gain.

Medication may affect appetite or weight

Some medicines can:

increase appetite
alter metabolism
reduce activity
cause fluid retention
affect muscle

Steroid medication is one example that may contribute to increased appetite and weight gain.

Do not reduce, stop or change prescribed medication yourself.

Tell your vet about the weight change so the complete care plan can be reviewed.

Neutering and weight

Some dogs may require fewer calories after neutering, while appetite and activity can also change.

This does not mean that every neutered dog will become overweight.

BSAVA recommends monitoring bodyweight and controlling food intake after neutering rather than treating weight gain as inevitable.

Ask your veterinary team:

when to review the portion
how often to weigh the dog
whether the food remains appropriate
how body condition should be monitored

Ageing changes energy needs

As dogs grow older, they may:

move less
lose muscle
develop arthritis
sleep more
require different medication
need shorter walks
have changing nutritional needs

Do not respond by removing most of their exercise or making a large food reduction without assessment.

A senior dog may need:

pain management
several shorter walks
non-slip flooring
a carefully chosen diet
regular weight and muscle checks
veterinary investigation of mobility changes

Puppies need careful monitoring

A growing puppy should not be placed on an adult weight-loss diet without veterinary advice.

Puppies need enough energy and nutrients for:

growth
bone development
muscle
immune function
learning and activity

However, rapid or excessive growth can also create health risks.

BSAVA recommends beginning weight and body-condition monitoring during puppyhood and accounting for individual breed variation.

Ask your vet to check your puppy’s growth and body condition during routine appointments.

Why excess weight can make walking harder

A heavier dog may find activity more difficult because of:

increased load on joints
reduced fitness
breathing difficulty
poorer heat tolerance
existing pain
reduced muscle

This can create a cycle:

The dog gains weight.
Movement becomes less comfortable.
Activity decreases.
Fitness and muscle decline.
Further weight gain becomes easier.

The answer is not to force a struggling dog through a long or intense walk.

The plan needs to address food, health, pain and suitable movement together.

Exercise helps, but it is not the whole plan

Exercise supports:

cardiovascular fitness
muscle
mobility
mental wellbeing
routine
suitable energy use

However, increasing exercise alone may not produce safe or reliable weight loss when calorie intake remains too high.

Blue Cross advises combining appropriate exercise with a structured feeding plan and veterinary guidance.

Think of walking as one part of the care plan rather than a way to “burn off” unlimited treats.

Increase activity gradually

Do not move from short walks to long hikes or intense ball games overnight.

A dog carrying excess weight may already have:

joint discomfort
reduced stamina
poor heat tolerance
breathing problems
low muscle strength

Begin at a level the dog can manage comfortably.

Your vet may recommend:

several shorter walks
flatter routes
slower movement
controlled lead walking
gentle strengthening
veterinary physiotherapy
hydrotherapy where appropriate
gradual increases based on progress

Stop and seek advice when the dog develops:

lameness
marked stiffness
breathing difficulty
collapse
reluctance to continue
pain
excessive panting unrelated to conditions

Avoid relying on repeated ball throwing

Fast repetitive retrieving can involve:

sudden acceleration
sharp turns
twisting
jumping
hard stops

This may be unsuitable for an overweight, painful or unfit dog.

Calmer activities may include:

steady walking
sniffing
simple scent searches
gentle play
controlled movement
reward-based training

Choose activities with your dog’s health, mobility and confidence in mind.

Sniffing still matters

A weight-management walk does not need to become a military march.

Sniffing gives dogs:

environmental information
mental stimulation
choice
a reason to engage with the walk

A slower walk with time to investigate can still provide useful movement.

My Dog Walking and Everyday Exercise Guide explains why quality, pace and individual suitability matter alongside distance.

How solo walks may support a plan

My one-to-one walks can provide a consistent opportunity for:

suitable local movement
time to sniff
a pace adapted to the dog
quieter routes
gentle confidence building
regular observations for the owner

I do not provide veterinary weight-loss treatment.

A dog walk cannot replace:

a veterinary examination
an agreed feeding plan
pain management
physiotherapy
medical treatment

Where your vet is happy for the dog to walk, I can follow the owner’s agreed routine and avoid treating exercise as punishment.

Read about Solo Dog Walks in Finchley and Muswell Hill.

Create a veterinary weight-management plan

A useful plan may include:

current weight
body-condition score
muscle-condition assessment
target weight or target body condition
daily food allowance
permitted treats
suitable exercise
health or mobility considerations
review date
weigh-in schedule
maintenance plan once the target is reached

BSAVA recommends that dogs with obesity receive an individual care plan covering weight reduction, later maintenance and any associated medical conditions.

Do not copy another dog’s food quantity or target.

Weight-loss diets

A veterinary weight-management diet may be useful for some dogs.

These diets can be formulated to provide appropriate nutrients while reducing calorie intake and supporting fullness or muscle retention.

Simply feeding a very small amount of ordinary food may reduce essential nutrients as well as calories.

Ask your veterinary team:

whether the current food can be adjusted safely
whether another diet would be more appropriate
how to change food gradually
how much to feed in grams
how treats should be included
what progress should be expected

BSAVA recommends feeding a complete and balanced diet suited to the animal’s nutritional needs.

Avoid crash diets

Weight loss should be gradual and monitored.

A very large reduction may:

leave the diet nutritionally inadequate
increase hunger and scavenging
reduce muscle
make the plan difficult to maintain
be inappropriate for the dog’s health

BSAVA reports that weight loss in veterinary care plans is commonly gradual and emphasises prioritising health, wellbeing and preservation of muscle rather than chasing the fastest possible percentage loss

Follow the target set by your veterinary team.

Monitor progress consistently

Use the same method where practical.

Record:

weight
body-condition score
waist measurement when advised
daily food
treats
exercise
mobility
appetite
changes in health

Take photographs from above and the side while the dog stands naturally.

A useful comparison may take several weeks.

Do not weigh the dog several times a day or make daily food changes based on tiny fluctuations.

What if your dog stops losing weight?

A plateau does not necessarily mean the plan has failed.

Check:

whether portions are still weighed
whether the food changed
whether different people give extras
whether exercise decreased
whether treats increased
whether the dog is scavenging
whether medication changed
whether their health or mobility changed

Speak to your veterinary practice before reducing the food further.

The plan may need recalculating as bodyweight, activity and health change.

Preventing weight regain

Reaching a target is not the end of the process.

Dogs can regain weight when:

weighing stops
portions gradually increase
old treats return
exercise changes
owners celebrate the result with food
illness or ageing alters activity

Agree a maintenance portion and continue checking:

weight
ribs
waist
abdominal tuck
muscle
mobility

Use kindness rather than shame

Comments about a “fat”, “lazy” or “greedy” dog do not create a better care plan.

Dogs do not calculate their own calorie needs or purchase their own food.

Owners may also be dealing with:

financial constraints
disability
illness
reduced mobility
confusing feeding advice
several family carers
a dog who constantly seeks food
guilt about reducing treats

The most helpful approach is practical:

identify the current situation
agree achievable changes
monitor progress
ask for support
adjust the plan when needed

When weight gain needs veterinary investigation

Arrange a veterinary appointment when your dog:

gains weight despite measured portions
becomes suddenly less active
develops coat or skin changes
drinks or urinates more
develops a swollen abdomen
becomes weak
appears painful
has breathing difficulty
develops a sudden change in appetite
gains weight after starting medication
has reduced mobility

Do not assume that every change is caused by overfeeding.

Unexplained weight loss also matters

This guide focuses on excess weight, but unexpected weight loss also requires attention.

Contact your vet when your dog loses weight without an agreed plan, particularly alongside:

increased appetite
reduced appetite
vomiting
diarrhoea
increased thirst
weakness
muscle loss
coughing
pain
changes in behaviour

A dog becoming lighter is not automatically positive.

Common dog weight-management mistakes

Avoid:

cutting the portion sharply without advice
relying only on the number on the scales
judging by breed charts alone
ignoring muscle loss
forgetting treats and chews
using cups rather than scales
allowing several people to feed extras
forcing intense exercise
assuming panting proves obesity
blaming the dog
repeatedly changing food
using weight-loss supplements without veterinary advice
failing to investigate pain
stopping checks once the target is reached

Frequently asked questions

How can I tell whether my dog is overweight?

Check whether you can feel the ribs easily, see a waist from above and see an abdominal tuck from the side.

Ask your veterinary team to confirm the body-condition score because coat, breed and muscle can make home assessment difficult

What is the ideal body-condition score for a dog?

On the commonly used nine-point scale, four or five is generally considered ideal.

Scores of six or seven indicate an overweight condition, while eight or nine indicate obesity. (BSAVA)

Should I be able to see my dog’s ribs?

In most dogs, the ribs should be easy to feel but not strongly visible.

Naturally lean breeds may look different, so ask your veterinary team to assess your individual dog.

Should I feed the amount printed on the packet?

Use it as a starting point.

Your dog’s actual requirement may differ according to body condition, activity, age, health and treats. Adjustments should be based on weight and body-condition monitoring.

How much should I reduce my dog’s food?

Do not apply one standard percentage to every dog.

Ask your vet or veterinary nurse to calculate an appropriate plan based on the food, current condition, target and health.

How quickly should my dog lose weight?

Weight loss should be gradual and monitored.

The appropriate rate depends on your dog and should be agreed with your veterinary team. Rapid loss can affect muscle and may indicate that the plan needs changing.

Can I give treats during weight loss?

Often yes, but they need to be included within the daily allowance.

Use small portions, part of the normal food or an alternative reward approved within the plan.

Will walking alone make my dog lose weight?

Walking can improve fitness, mobility and wellbeing, but weight management normally also requires control of total calorie intake.

A walk cannot compensate reliably for unrestricted treats or oversized portions.

Should I exercise my overweight dog more?

Activity may need increasing, but it should be gradual and suited to the dog’s joints, breathing, fitness and health.

Speak to your vet before changing the routine of a painful, unfit or medically affected dog.

Can neutering make a dog gain weight?

Energy needs and appetite may change after neutering, but weight gain is not inevitable.

Monitor weight and body condition and adjust food with veterinary guidance.

Can illness cause weight gain?

Yes, although diet and activity imbalance is more common.

Conditions such as hypothyroidism and Cushing’s disease, as well as some medicines, may contribute. Arrange a veterinary check when weight gain is unexpected or accompanied by other symptoms.

Is a “light” dog food suitable for weight loss?

Not automatically.

Some lighter foods are intended to help prevent weight gain rather than produce weight loss. Ask your veterinary team whether the product supplies suitable nutrition at the required portion.

Can I replace part of the meal with vegetables?

Do not significantly alter a complete diet without advice.

Some vegetables may be suitable as occasional small treats for particular dogs, but they do not provide a balanced replacement for a complete food.

What if my dog constantly begs?

Begging does not always mean the dog requires more calories.

Use measured portions, keep feeding consistent, provide suitable activity and discuss persistent hunger with your vet.

A healthy plan is more useful than blame

Helping an overweight dog does not begin with guilt.

It begins with information.

Check their shape.

Feel their ribs.

Record their weight.

Measure every meal.

Count treats and chews.

Ask everyone in the household to follow the same plan.

Most importantly, involve your veterinary team before making a major change.

A safe weight-management plan should help your dog become healthier and more comfortable while protecting nutrition, muscle and enjoyment of everyday life.

For broader feeding guidance, visit the Dog Food and Nutrition Hub.

For individual exercise advice, read Dog Walking and Everyday Exercise.

Veterinary disclaimer

This article provides general information about dog weight, body condition, feeding and exercise.

It does not diagnose obesity, illness, pain or another medical condition, calculate an individual calorie requirement, prescribe a diet or replace an examination by a veterinary surgeon.

Under the Veterinary Surgeons Act 1966, diagnosis and veterinary treatment are matters for an appropriately qualified veterinary surgeon.

Contact your veterinary practice before starting a weight-loss plan and whenever your dog develops unexplained weight change, breathing difficulty, pain, weakness, appetite changes or reduced mobility.