How Much Should I Feed My Dog? Portions, Calories and Body Condition

Updated September 2026

No single number of grams is right for every dog.

The feeding guide on your dog’s food is the best practical starting point, but it is still only a starting point. Weigh the food rather than estimating it with a cup or scoop, include treats and other extras, and then monitor your dog’s weight and body condition.

Two dogs that both weigh 20kg may need different amounts. Their age, activity, body condition, health and the calorie content of the particular food can all affect how much they need.

If your dog is unexpectedly gaining or losing weight, is unusually hungry, has lost their appetite or has a medical condition, speak to your veterinary team rather than continually adjusting the portion yourself.

For the wider subject of choosing food, labels, wet versus dry food and feeding safely, start with Dog Food & Nutrition Hub.

How much should I feed my dog?

Start with the feeding guide for the exact food you are using.

Commercial dog foods vary widely in how much energy they contain, so a portion appropriate for one food may be completely wrong for another.

UK Pet Food explains that manufacturers’ feeding guides give a recommended total daily amount, which you can then divide among however many meals you feed. You still need to adjust the amount based on your dog’s weight, age, life stage, and activity.

I would then do three things:

1. Weigh the portion accurately.
2. Include treats, chews and other food in the overall picture.
3. Monitor whether your dog maintains an appropriate weight and body condition.

PDSA similarly recommends using the packet guidance as a starting point, weighing portions with scales and feeding according to the dog’s ideal or target weight rather than blindly following a number on the packet. (

My dog weighs 20kg. How many grams should I feed?

You cannot work out a reliable number of grams from body weight alone.

This is one of the most important points on this page.

Imagine two different foods.

One might provide considerably more calories in 100g than the other. Giving the same number of grams of each would therefore provide different amounts of energy.

You also cannot assume every 20kg dog needs exactly the same number of calories.

One might be a young, very active dog in lean condition.

Another might be older, neutered, less active and already carrying excess weight.

Start with the feeding recommendation for the particular food and your dog’s appropriate weight category. Then monitor the dog rather than treating the packet as a permanent prescription.

Should I measure dog food with a cup or scoop?

I prefer digital kitchen scales.

A scoop, cup, mug or handful can vary surprisingly easily from one meal to the next.

That matters especially with calorie-dense dry foods, where what looks like a small extra amount each day can add up over weeks and months.

BVA recommends weighing food accurately to help dogs maintain a healthy weight, while UK Pet Food specifically recommends measuring portions by weight rather than volume.

You do not need expensive specialist equipment.

A straightforward set of kitchen scales that measures in grams is normally enough.

An easy way to measure the whole day

If your dog’s total allowance is 240g per day, you could weigh all 240g in the morning.

You can then divide it between:

• breakfast
• dinner
• training rewards
• a food toy
• a sniffing game.

This makes it much easier to see what your dog is genuinely eating.

Is the amount printed on the dog-food packet accurate?

It is useful, but it cannot be exact for every individual dog.

Packet feeding guides are designed to give you a sensible starting point.

Your dog may ultimately need a little more or a little less.

Factors that can affect their needs include:

• age
• life stage
• current and ideal weight
• body condition
• activity
• breed and body size
• neuter status
• health
• pregnancy or lactation
• the calorie density of the diet
• treats and additional food.

WSAVA’s nutrition guidance similarly emphasises assessing nutrition around the individual animal rather than assuming a single feeding recommendation fits every dog.

The useful question is therefore not:

“Am I following the packet perfectly?”

It is:

“Is this amount keeping my dog in an appropriate condition?”

Should I feed for my dog’s current weight or ideal weight?

If your dog is already at a healthy weight and body condition, their current weight may be a useful starting point.

If they are overweight or underweight, the answer becomes less straightforward.

PDSA advises feeding around a dog’s target or ideal weight rather than simply using their current overweight weight to select a packet portion.

However, I would not create a substantial weight-loss or weight-gain plan based on an online article.

Your vet or veterinary nurse can:

• weigh your dog accurately
• assess body condition
• help determine a realistic target
• calculate an appropriate feeding plan
• check whether a medical problem is contributing
• monitor progress safely.

This is particularly important for a dog who is very overweight, markedly underweight or losing weight unexpectedly.

How do I know whether I am feeding the right amount?

Do not rely on the scales alone.

Weight and body condition work together.

For many dogs in healthy condition, you should generally be able to feel their ribs without pressing through a thick layer of fat, see a waist from above, and see some abdominal tuck from the side.

Breed and individual build still matter.

PDSA recommends using body condition scoring alongside weight rather than relying only on the number on the scales.

I have a separate guide showing you what to look and feel for:

Healthy Weight and Body Condition in Dogs

How often should I weigh my dog?

No single schedule fits every healthy dog.

What matters is noticing a trend before it becomes a much larger change.

For a healthy adult dog whose weight has been stable, regular checks at home or during routine veterinary visits may be sufficient.

More frequent monitoring may be useful when:

• you are deliberately changing a portion
• your dog is losing weight under veterinary guidance
• your dog needs to gain weight
• activity has changed significantly
• a puppy is growing
• an older dog is losing muscle
• medication or illness affects appetite or weight.

If you cannot easily weigh your dog at home, body condition and how equipment fits can also provide useful clues between proper weigh-ins.

What I sometimes notice as a dog walker

Small changes are easier to notice when I haven’t seen a dog every hour of every day.

A harness may suddenly feel tighter.

A waist that was easy to see may gradually become less obvious.

An older dog may feel bonier around the back or thighs even though their overall weight has not changed dramatically.

That does not allow me to diagnose anything.

It does give me something useful to mention to the owner.

If a client’s dog seems to be changing noticeably, I would rather say, “I’ve noticed this feels a little different” than silently assume it is normal.

That same principle applies at home. Look for changes over time rather than waiting for someone to tell you your dog is overweight or thin.

Do treats count towards my dog’s daily food?

Yes.

Treat calories do not disappear because the food was used for training, given on a walk or handed over because your dog looked hopeful.

The day’s intake can include:

• normal meals
• training rewards
• dental chews
• treats
• food inside toys
• lick mats
• scraps
• food used to give medication
• things another household member gives them.

WSAVA and PDSA recommend keeping treats and extras to around 10% or less of the dog’s daily calorie intake, leaving the majority of nutrition to the appropriate complete diet.

For more detail, use How to Choose the Right Dog Treats.

If the food is being used specifically for training, see Dog Training Rewards.

Can I use some of my dog’s normal meal for treats?

Yes.

For dogs who value their normal food, this can be a particularly simple way to stop training rewards becoming invisible extra calories.

For example, if your dog is allowed 250g of their food per day, you could put part of that amount into your treat pouch before preparing breakfast and dinner.

You have not added another meal.

You have simply changed where some of the daily allowance is eaten.

This will not suit every training situation. Some dogs need a higher-value reward when learning something difficult or working around distractions.

But for easy skills at home, part of a normal meal can work perfectly well.

What about food used in KONGs, lick mats and enrichment?

It counts too.

Food enrichment can be excellent, but it is still food.

If breakfast goes into a KONG rather than a bowl, that is straightforward. It is still breakfast.

The problem arises when the dog eats breakfast and then gets an additional food-stuffed toy, a lick mat, and several handfuls of treats without anyone considering the total intake.

Where practical, use part of the dog’s normal measured allowance.

You can find more feeding ideas in Ditch the Bowl at Mealtimes.

For enrichment beyond food, see Dog Enrichment Ideas

Should I feed less if my dog has had treats?

Sometimes, yes.

If treats are a regular part of the day, you need to account for their calories.

That does not mean trying to mathematically compensate for every crumb your dog ever receives.

It means being realistic about the whole diet.

A dog who gets a handful of training food every day is in a different situation from a dog who receives one tiny occasional treat.

If you regularly use lots of rewards, setting aside part of the normal ration is often the simplest approach.

Does exercise determine how much food my dog needs?

Activity matters, but the relationship is not as simple as “long walk equals extra dinner”.

A highly active working or sporting dog may need considerably more energy than a relatively sedentary dog of the same weight.

But an ordinary longer-than-usual walk does not necessarily justify a large extra meal.

UK Pet Food identifies activity level as one of several factors affecting nutritional requirements alongside size, weight and life stage.

I would look at activity across weeks and months rather than continually adding food after individual walks.

If your dog’s normal lifestyle changes significantly, review both their weight and feeding amount.

Does neutering mean I should automatically feed less?

Not automatically, but energy needs can change.

This is why I would monitor the individual dog rather than impose an arbitrary reduction the day after neutering.

If activity, appetite and metabolism change and body condition begins creeping upwards, the portion may need reviewing.

Your veterinary team can help you decide whether the food itself or simply the amount needs changing.

The important thing is not waiting until substantial weight gain has already occurred.

Does my dog’s age affect how much they should eat?

Yes, but age does not give you one automatic feeding amount.

Puppies

Growing puppies have different nutritional and energy requirements from adult dogs.

Rather than reproduce puppy feeding tables here, I’ll send you to my dedicated Puppy Feeding Guide.

UK Pet Food notes that puppy feeding guides are starting points and still need adjusting for the individual puppy’s age, weight and activity.

Adult dogs

For a healthy adult, use the particular food’s feeding guide, weigh the portion and monitor condition.

Senior dogs

Some older dogs become less active and need fewer calories.

Others lose weight or muscle and may need a completely different approach.

Do not simply reduce a dog’s food because they have reached a particular birthday.

My recently updated Senior Dog Nutrition Guide covers that subject separately.

How often should I feed the daily amount?

For most healthy adult dogs, dividing the daily allowance into two meals is a sensible starting point.

The important word there is dividing.

If the feeding recommendation is 300g per day, feeding twice a day does not mean giving 300g twice.

It means dividing the day’s allowance between the meals.

We now have a separate guide specifically for meal frequency and routines, so I would keep this page focused on quantity:

How Often Should I Feed My Dog? Mealtimes and Feeding Routines

What if I feed wet and dry food together?

Do not simply feed the full recommended wet-food portion plus the full recommended dry-food portion.

That can effectively turn two complete daily allowances into one very large intake.

Check the manufacturer’s mixed-feeding instructions where available.

If the products do not provide mixed-feeding guidance, ask the manufacturer or your veterinary team how to combine them appropriately.

The same principle applies when you add significant amounts of another food to a normal complete diet.

“Only a topper” can still contribute meaningful calories if you use it every day.

For help comparing food formats, see Wet, Dry, Fresh or Raw Dog Food?

Why can two dog foods have very different portion sizes?

Because grams measure weight, not calories.

Different foods contain different amounts of water, fat, protein, carbohydrate, and fibre, so their energy density can vary substantially.

A wet food contains much more water than most dry food, so its recommended portion may look much larger in grams.

That doesn’t automatically mean the dog is getting more calories.

That is why you shouldn’t copy the gram amount from your old food when switching to a completely different product.

Use the feeding instructions for the new food.

If you are changing diets, use my How Do I Change My Dog’s Food? guide.

What are calories in dog food?

Calories are a measure of energy.

Dog-food packaging or the manufacturer’s website may give the food’s energy content as kilocalories, often written as kcal.

This can be useful because two foods weighing the same amount can supply very different amounts of energy.

You do not normally need to calculate every calorie yourself to feed a healthy dog appropriately.

For most owners, the practical approach is still:

• use an appropriate complete food
• start with its feeding guide
• weigh the portion
• monitor body condition
• adjust with veterinary advice where necessary.

Calorie calculations become more useful when a veterinary professional is developing an individual weight-loss, weight-gain or medical feeding plan.

Should I calculate my dog’s calorie requirement online?

Treat generic calorie calculators as estimates, not prescriptions.

Veterinary professionals can calculate an estimated energy requirement, but even calculated values need adjustment based on the dog’s actual response.

WSAVA provides calorie and body-condition tools for veterinary nutritional assessment, but its wider guidance emphasises individual assessment rather than feeding purely by formula.

I would therefore avoid chasing an apparently precise online number while ignoring the dog standing in front of you.

My dog is overweight. Should I simply reduce their normal food?

A small adjustment may sometimes be appropriate, but substantial weight loss deserves a proper plan.

Simply cutting a normal maintenance diet dramatically can reduce not only calories but also essential nutrients.

BSAVA notes that modest restriction of a complete diet may be appropriate in some mildly overweight animals, but more substantial obesity generally needs a structured approach and may require a diet specifically designed for weight reduction.

If your dog is significantly overweight, I would ask your veterinary practice for help.

Many practices run weight clinics with veterinary nurses.

For assessing the starting point, use Healthy Weight and Body Condition in Dogs.

My dog is underweight. Should I just feed more?

Not until you have thought about why they are underweight.

A dog may simply need a portion adjustment.

But unexplained weight loss can also accompany dental problems, digestive disease, pain and many other medical conditions.

This is particularly important if the dog is:

• continuing to lose weight
• eating normally but becoming thinner
• eating much more than usual
• drinking more
• vomiting
• experiencing persistent diarrhoea
• losing muscle
• reluctant to eat
• having difficulty chewing or swallowing.

Speak to your vet rather than repeatedly adding food without finding out what is happening.

What if my dog always seems hungry?

Some dogs are extremely convincing.

Appetite alone doesn’t prove the portion is too small.

Look at:

• body condition
• weight trend
• activity
• the actual amount fed
• treats and extras
• whether something about the feeding routine has changed.

A dog who is maintaining or gaining excess weight while continually asking for food does not necessarily need a larger portion.

If hunger increases markedly or suddenly, particularly alongside weight loss, increased thirst or another health change, speak to your vet.

What if my dog leaves food in the bowl?

An occasional unfinished meal is not automatically a problem.

But a persistent or sudden appetite change deserves attention.

Think about:

• whether you have changed the food
• whether treats are filling the dog up
• whether the portion is too large
• whether eating appears uncomfortable
• whether there is vomiting or diarrhoea
• whether the dog seems otherwise unwell.

Do not repeatedly swap food or add richer extras simply to persuade a dog to eat without considering why their appetite changed.

Should I reduce food if my dog cannot exercise normally?

Possibly, but not by an arbitrary amount.

A dog recovering from injury, surgery or illness may be using less energy, but recovery can also affect nutritional requirements.

That makes this a poor time for guesswork.

If restricted exercise will continue for more than a very short period, ask your veterinary team whether the portion should change.

You can still use appropriate mental enrichment without continually adding calories.

How can I tell whether the amount is working?

Look at trends.

I would ask:

• Is my dog’s weight reasonably stable?
• Can I feel their ribs appropriately?
• Can I see a waist?
• Has their shape changed?
• Are they maintaining muscle?
• Has their activity changed?
• Am I honestly accounting for treats and extras?
• Has their appetite changed?
• Does their harness fit differently?
• Is there a health change that needs investigating?

BSAVA recommends monitoring both body weight and body-condition score regularly and adjusting diet to maintain a healthy condition.

The correct feeding amount is ultimately the amount that supports the individual dog’s nutritional needs and healthy condition, not simply the number printed on the back of the bag.

A simple portion routine

For a healthy adult dog, I would keep it straightforward.

1. Choose an appropriate complete food

Make sure the main diet suits the dog’s life stage.

For more on this, see What Does Complete Dog Food Mean?

2. Find the manufacturer’s feeding guide

Use the information for that particular product.

3. Consider your dog’s appropriate weight

If youare unsure whether your dog is overweight or underweight, ask your veterinary practice.

4. Weigh the day’s allowance

Use kitchen scales rather than estimating with a scoop.

5. Set aside training food if needed

This helps prevent rewards from becoming unnoticed extras.

6. Divide the remainder between meals

For many adult dogs, that will be two meals.

7. Keep an eye on treats and chews

They still count.

8. Monitor weight and body condition

Do not wait until a change becomes dramatic.

9. Adjust sensibly

Small adjustments may sometimes be appropriate. Major weight changes deserve veterinary guidance.

Frequently asked questions

How many grams should a dog eat per day?

There is no universal grams-per-kilogram figure that works for every dog and every food.

Use the feeding guide for the exact food as your starting point because different foods contain different amounts of energy per gram.

How much should a 10kg dog eat?

The dog’s weight alone is not enough to give a reliable gram amount.

Check the feeding guide for the food, consider the dog’s ideal weight and body condition, weigh the portion and monitor the result.

How much should a 20kg dog eat?

Again, there is no universal portion for a 20 kg dog.

A 20kg dog eating one food may need a very different number of grams from another 20kg dog eating a more calorie-dense food.

Is one cup of dog food a day enough?

A cup is not a reliable universal measure.

The answer depends on the food, cup size and individual dog. Weighing food in grams is much more accurate.

Should I feed the amount for my dog’s current weight?

If your dog is in healthy condition, the current weight may be an appropriate starting point.

If your dog is overweight or underweight, speak to your veterinary team about an appropriate target rather than automatically feeding for the current weight.

Does my dog need more food because they walk every day?

Not necessarily.

Normal daily exercise should already form part of your dog’s usual energy requirements.

Substantially more demanding activity over time may alter those needs, but one longer walk is not automatically a reason for a larger dinner.

Should I weigh wet dog food?

You can.

If the packet gives the daily portion in grams, weighing it is an accurate way to know what your dog is receiving.

Do chews count towards the daily allowance?

Yes.

Chews, treats, training rewards and food used for enrichment all contribute to the day’s intake.

What if the packet amount makes my dog gain weight?

Check that you are measuring accurately and account for treats and extras.

Then review your dog’s body condition and speak to your vet or veterinary nurse about an appropriate adjustment.

The packet gives you a starting point. Your dog gives you the answer.

There is no need to make feeding unnecessarily complicated.

Start with an appropriate complete diet.

Use the manufacturer’s guidance.

Measure the food in grams.

Include the extras.

Monitor your dog’s weight and shape.

Then adjust when there is a genuine reason.

The mistake is assuming either that the packet can never be wrong for your individual dog or that you should ignore it completely and guess.

For the wider subject of food choice, feeding, treats, labels and nutrition, continue with my Dog Food & Nutrition Hub.

Disclaimer

I am a professional dog walker and pet sitter, not a veterinary surgeon or veterinary nutritionist. This article provides general feeding information for dog owners and is not an individual feeding prescription. Speak to your veterinary team about unexplained weight or appetite changes, obesity, underweight dogs, medical conditions, therapeutic diets or significant dietary changes.

• Dog Food & Nutrition Hub: A Practical UK Guide for Dog Owners
• Choosing the Best Cat Food: A Practical UK Guide
• Over Half of UK Dogs Are Overweight: How to Prevent and Manage Obesity in Dog
• Healthy Weight and Body Condition in Dogs
• How to Feed Adult Dogs Properly for Better Health and Energy