How much food does a dog really need?

An adult dog living in a household needs roughly 1.6 times the energy it burns at rest: about 630 kcal a day for a 10 kg dog and about 1,440 kcal for a 30 kg dog. That is the starting point given by the MSD Veterinary Manual, not a rule: two dogs of the same weight can differ in their needs by 30% (MSD) or even up to 50% (WSAVA). So the only reliable answer to "how much food" is a combination of a calculation, a set of scales and a body condition check you can do at home.

How many calories does a dog need per day

It depends on weight, but not in proportion: the need rises with "metabolic weight" (kg^0.75), so a small dog needs more per kilogram than a large one. For healthy dogs the MSD Veterinary Manual uses two steps: first the resting energy requirement (RER = 70 × kg^0.75), then the maintenance energy requirement (MER) as a multiple of RER depending on age and neuter status. The same source warns that any formula is only a starting point to be adjusted to how the dog responds; an animal of the same weight may need up to 30% more or fewer calories than another.

Calculated with the MSD formulas (RER = 70 × kg^0.75; factors 1.6 / 1.8 / 1.4). For puppies MSD gives 3 × RER up to 4 months and 2 × RER after that. The European industry guideline FEDIAF reaches similar figures by another route: for dogs aged 3 to 7 it recommends a starting point of 110 kcal per kg^0.75 (range 95–130), 130 for young adults of 1–2 years and 95 kcal for dogs over 7, which is almost exactly 1.6 × 70.

How to turn calories into grams of food

Divide the daily calories by the energy value of the food, printed on the bag as kcal/kg or kcal/100 g (for cans often kcal per can). That is exactly what the WSAVA recommends in its FAQ: divide the energy need by the calorie density of the chosen food and you have a good starting point.

The table shows why "one cup" is not a measurement: with a 4,200 kcal/kg food, a 30 kg dog's meal is 90 g smaller than with a 3,300 kcal/kg food. So weigh the food on a kitchen scale rather than scooping it; flakes, granules and kibble of different sizes weigh very different amounts in the same cup. How to read the label and where to find the calories on it is explained in our guide How to choose dog food.

Why dogs of the same weight differ so much

Because they burn energy differently. According to MSD the requirement is not a linear function of weight, and dogs kept in households often need fewer calories than dogs kept in kennels; FEDIAF notes that an individually housed dog with little opportunity to move may need as little as about 70 kcal/kg^0.75 a day, while dogs housed in active groups may need more than 144, twice as much. The need is shaped by:

So it helps to know where your dog sits: a pug that spends most of the day on the sofa is near the lower end, a working border collie or Siberian husky near the upper end. If your dog, whatever the breed, gains weight quickly, MSD recommends starting at 1.4 × RER. The typical weight and activity level of every breed, for example the Labrador retriever (25–36 kg), is in our dog breed directory.

How to check whether you are feeding the right amount

Not with the bowl but with your hands and a scale. The WSAVA recommends body condition scoring on a scale of 1 to 9, where 4 and 5 are ideal: ribs easily felt with minimal fat covering, waist visible from above, abdomen tucked up from the side. At 6 the ribs are felt under a slight layer of fat and the waist is less distinct; at 7 the ribs are hard to feel and the waist disappears. At 3 and below the ribs are visible without touching.

How many treats can a dog have

According to the WSAVA, no more than about 10% of daily calories: for a 10 kg dog that is around 60 kcal, one slice of cheese or a few pieces of carrot. Anything above that displaces balanced food and adds weight. Low-calorie options named by the WSAVA are fruit and vegetables (carrot, cucumber, apple without the core); what a dog can and cannot eat is covered in Can dogs eat …? and Foods toxic to dogs and cats.

Why too much food is a serious problem

Because it shortens life. A study of 48 Labrador retrievers (Kealy et al., JAVMA 2002), fed in pairs from eight weeks of age until death with one dog of each pair getting 25% less food than its partner, found that the food-restricted dogs had less body fat, a significantly longer median life span and a later onset of signs of chronic disease. FEDIAF notes that about a third of dogs and cats over one year of age seen in veterinary practices are overweight or obese, rising to almost half between the ages of 6 and 11, with a very similar picture in Europe.

A dog that begs is not necessarily hungry. A dog whose ribs you can feel without pressing is fed correctly.

Three myths about how much to feed

"The bag says how much it should eat." It says how much an average dog of that weight would eat. WSAVA: the guide is a good starting point, but individual dogs deviate by up to 50% either way, so adjust by weight and condition.

"A cup is a cup." It is not. Foods range from 3,200 to more than 4,200 kcal/kg and differ in particle density; the same cup can be a quarter of a meal off. Weigh in grams.

"An active dog needs a double portion." Maybe, or maybe only 10% more. FEDIAF gives a range from 70 to more than 144 kcal/kg^0.75; what your dog needs is decided by the scale, not by feel.

Frequently asked questions

How much food does a 10 kg dog need?

By the MSD formula a neutered adult of 10 kg needs about 630 kcal a day, which with kibble of 3,500–3,800 kcal/kg is roughly 165–180 g. That is a starting point; adjust it by weight and condition.

How much food does a 30 kg dog need?

About 1,440 kcal a day (neutered) or 1,615 kcal (intact), which with a 3,800 kcal/kg food is roughly 380–425 g of kibble. Older or less active dogs need less.

How many times a day should an adult dog eat?

Split the daily amount into two meals; FEDIAF notes that feeding several meals slightly raises the energy spent on digestion. What matters is the total daily amount, not the number of meals.

How do I know my dog is overweight?

On the WSAVA scale: at 6 and above the ribs are felt only under a layer of fat or not at all, the waist is not visible from above and the abdomen is not tucked up from the side. The ideal scores are 4 and 5.

Does a neutered dog really need less food?

Yes. MSD uses a factor of 1.6 × RER for neutered adults and 1.8 × RER for intact ones, a difference of about 11%. Reduce the portion after neutering and weigh the dog.

How much food does a puppy need?

According to MSD about 3 × RER up to 4 months and 2 × RER after that, far more per kilogram than an adult, split into several meals. Use a growth food and agree the amount with your vet.

Can I give my dog treats every day?

Yes, up to about 10% of daily calories (WSAVA). Subtract them from the meal and choose low-calorie ones: a piece of carrot rather than a slice of sausage.

In closing

The calculation gives you the start; the scale and your hands give you the answer. Once you find the amount at which your dog keeps a score of 4–5, hold it and re-check at every change: neutering, age, winter, a new food. What should be in the bowl, not just how much, is explained in our guide to choosing dog food.