A surprisingly large number of dog owners don't realise their dog is overweight.

We see it all the time.

The dog looks happy. They still run around. They eat enthusiastically. Nothing appears obviously wrong.

But gradually, over months or years, a little extra food every day becomes a little extra body fat.

Then a little more.

Until what has become normal to look at is no longer an ideal body condition.

This matters because excess weight in dogs isn't simply cosmetic.

It places additional load on the body and is associated with poorer health, reduced mobility and a greater risk of several medical conditions.

Australian research involving 2,661 dogs presented to veterinary practices found 33.5% were overweight and another 7.6% were obese — approximately 41% combined. A 2026 review from researchers at the University of Sydney continues to describe overweight and obesity as common problems in dogs and cats and highlights their potential impact on both health and welfare.

So how do you actually know if your dog is a healthy weight?

The answer is not simply the number on the scales.

Your dog's ideal weight isn't just a number

Two dogs of the same breed can weigh exactly the same and have very different body compositions.

One might carry more muscle.

Another may carry considerably more body fat.

Age, sex, build, muscle mass and individual frame size all matter.

That is why veterinarians commonly use a Body Condition Score, or BCS, alongside body weight.

The World Small Animal Veterinary Association uses a nine-point body-condition system.

For most dogs, approximately 4–5 out of 9 is considered ideal.

At an ideal body condition:

the ribs should be easy to feel without a thick layer of fat over them
there should be a visible waist when viewed from above
the abdomen should tuck upwards when viewed from the side

These are much more useful indicators than simply saying:

“My Labrador weighs 32kg, so he must be fine.”

There isn't one perfect number for every dog of a particular breed.

Try the rib test

This is probably the simplest check an owner can perform at home.

Run your hands gently along your dog's rib cage.

You should be able to feel the ribs reasonably easily without having to push through a substantial layer of fat.

The ribs generally should not be sharply protruding either.

RSPCA Australia describes an appropriately conditioned dog as having ribs that can be felt with some fat covering but without excessive fat over them.

Then stand above your dog and look down.

There should usually be a visible narrowing behind the ribs — a waist.

Now look from the side.

The abdomen should rise towards the hind legs rather than continuing horizontally or sagging downwards.

Ribs. Waist. Abdominal tuck.

Those three observations tell you far more than many owners realise.

Why we can become blind to an overweight dog

One of the difficult things about canine obesity is that it usually develops slowly.

You don't wake up one morning and suddenly have an overweight dog.

An extra 50 grams of food today doesn't visibly change anything.

Neither does tomorrow's.

Neither does an extra biscuit.

Neither does finishing the children's leftovers.

But calorie surplus is cumulative.

Research has even described a phenomenon sometimes called “weight blindness”, where owners underestimate their pet's body condition because heavier animals have become visually normal to them. The recent University of Sydney review identifies owner recognition of overweight and obesity as an important barrier to addressing the problem.

That is why looking objectively at body condition matters.

Not:

“He looks fine to me.”

But:

Can I easily feel his ribs?

Does he have a waist?

Does his abdomen tuck upwards?

Has his body shape changed over the last six months?

Why too much food becomes a problem

Dogs require energy to maintain basic body functions, move, exercise, regulate body temperature, repair tissue and live their everyday lives.

Food supplies that energy.

But when a dog consistently consumes more energy than its body uses, the excess does not simply disappear.

It is stored, primarily as body fat.

That's the basic problem.

The body only requires so much energy.

Once those requirements have been met, continually feeding beyond them creates a positive energy balance.

Over time, that can lead to excess body weight and eventually obesity.

This is why obesity isn't simply about whether an ingredient is “good” or “bad.”

An excellent complete and balanced food can still contribute to weight gain if too much of it is fed.

The Australian Veterinary Association specifically notes that excess calories can affect dog and cat health and describes obesity as one extreme of body condition with serious implications for pet health.

Extra body fat isn't just extra weight

We used to think of body fat primarily as stored energy.

We now understand that adipose tissue is biologically active.

Obesity is associated with inflammatory and metabolic effects throughout the body.

Overweight and obese dogs have increased risks associated with conditions including osteoarthritis, diabetes, cardiovascular problems and complications with anaesthesia, among others. Excess weight can also worsen mobility and existing joint disease.

RSPCA Australia specifically warns that obesity can contribute to serious health complications and exacerbate conditions such as osteoarthritis.

That matters particularly as dogs age.

A young dog may appear to carry several extra kilograms without obvious difficulty.

But those kilograms don't disappear when the dog becomes eight, ten or twelve years old.

The joints, muscles and cardiovascular system have been carrying them every day.

The feeding guide is a starting point — not a command

One of the biggest misunderstandings we see is owners treating the feeding recommendation on a dog-food bag as though it were an exact prescription.

It isn't.

Feeding guides are useful starting points.

But dogs vary enormously.

Two 25kg dogs eating the exact same food may require different amounts because one:

runs several kilometres each day
has more muscle
is younger
lives outdoors
has a higher activity level

while the other:

is desexed
sleeps most of the day
is older
gets numerous treats
has lower energy requirements

The dog's body condition tells you whether the amount is working.

That's the important part.

Measure the food once properly

This may be one of the simplest changes an Australian dog owner can make.

Stop guessing what a serving looks like.

People tell us:

“I give him about two cups.”

But what is a cup?

A level measuring cup?

A coffee mug?

A plastic scoop?

A heaped cup?

A cup measured loosely one day and generously the next?

And different kibble has different size, shape and density, meaning the same volume can represent a different weight of food.

The easiest method is to use an inexpensive kitchen scale.

If your feeding target is 200 grams per day:

Put your usual bowl, cup or scoop on the scale.
Zero the scale.
Measure 200g of the food.
Look at exactly where that amount reaches in your normal scoop or container.

Now you know what 200 grams of that particular food actually looks like.

If you feed twice daily, divide that total appropriately.

You do not necessarily need to weigh every meal forever.

If you stay on the same food and your dog's required amount doesn't change, you now have a reliable visual measure.

But if you change foods, measure again.

The same cup can contain a very different amount of another kibble.

Then monitor the dog

This is the part people sometimes forget.

The feeding amount is not something you calculate once when the dog is two years old and follow blindly for the next ten years.

Monitor.

Look.

Feel.

Adjust.

If your dog's waist gradually disappears and the ribs become harder to feel, something needs to change.

If the dog becomes too lean, the opposite may be true.

The appropriate amount can change as the dog:

grows
ages
becomes more or less active
is desexed
gains or loses muscle
changes food
develops health conditions

That's why body condition is so useful.

Feed the dog in front of you — not simply the number printed on the bag.

Don't forget treats

There is another bowl that many owners forget to count.

The invisible one.

Treats.

Training rewards.

Dental chews.

A piece of cheese.

A spoonful of peanut butter.

A bit of sausage.

Something dropped by the children.

The last piece of toast.

None of those looks particularly significant by itself.

Collectively, they can be.

RSPCA Australia specifically advises owners concerned about excess weight to watch treats, particularly calorie-dense foods such as cheese and peanut butter.

If your dog needs 800 calories a day, those calories don't suddenly stop counting because they came from a treat rather than the food bowl.

Everything counts.

Exercise matters — but you can't always outrun the bowl

Exercise is enormously important for dogs.

It supports:

cardiovascular fitness
muscle maintenance
mobility
enrichment
mental health
behaviour

But exercise should not become an excuse for chronic overfeeding.

For many dogs it is considerably easier to consume excess calories than it is to burn them.

Weight management usually requires attention to both sides of the equation:

energy consumed + energy used.

Animal Medicines Australia's wellness guidance similarly recommends preventing overweight and obesity by balancing calorie intake with activity and monitoring body condition.

What if your dog is already overweight?

Don't panic and don't suddenly halve the dog's food.

Weight reduction should be gradual and appropriate.

Start by establishing:

current weight
Body Condition Score
current daily food intake
treats and extras
activity level

Then determine an appropriate feeding target.

For dogs that are substantially overweight, have existing medical conditions, are elderly or gain weight unexpectedly despite apparently sensible feeding, a veterinarian should be involved.

There are medical conditions that can influence weight and metabolism, so unexplained weight changes shouldn't automatically be blamed on food.

But for many otherwise healthy dogs, one of the first useful questions remains very simple:

How much food is actually going into the dog every day?

Not approximately.

Actually.

Use the Pet Food Australia feeding calculator

We've tried to make this easier for PFA customers.

Our Dog Food Cost & Feeding Calculator allows owners to select their dog's weight and see an estimated daily feeding amount, how long different pack sizes may last and the approximate feeding cost per day.

It is a starting point rather than a substitute for watching your dog's individual body condition.

Use it to establish an amount.

Then look at your dog.

Feel the ribs.

Check the waist.

Monitor weight and body condition.

And adjust if necessary.

Pet Food Australia Dog Food Cost & Feeding Calculator
https://www.petfoodaustralia.com.au/pages/dog-food-cost-per-day-feeding-calculator

A healthy dog doesn't need to look skinny

There is an important distinction here.

We aren't suggesting dogs should be kept excessively lean.

Underweight dogs have their own health and welfare concerns.

The aim is appropriate body condition.

For most dogs, that means:

Ribs you can feel.

A waist you can see.

An abdomen that tucks upwards.

And enough appropriate nutrition to maintain muscle, energy and overall health.

One measurement can change years of feeding

This is perhaps the simplest message in this entire article.

If you regularly feed the same food:

measure it properly once.

Know how many grams your dog should receive.

See what that amount actually looks like in the scoop you use every day.

Then monitor the dog's body condition.

If you change foods, recalculate.

If the dog's weight or lifestyle changes, reassess.

Because the difference between the appropriate amount and “just a bit extra” can seem insignificant at one meal.

Over hundreds and thousands of meals, it isn't.

We have spent decades caring for dogs, and overweight dogs are something we see far too often.

Usually it hasn't happened because an owner doesn't care.

Often it is the opposite.

Food is love.

Treats are love.

Giving a little extra feels generous.

But when it comes to keeping a dog at a healthy weight, sometimes one of the most caring things we can do is simply put the correct amount in the bowl.

Measure once. Monitor regularly. Adjust when needed.

Your dog's body will tell you whether you're getting it right.