Dog Food Portions: Calculating and Adjusting Your Dog's Needs

What does "amount of food" mean for dogs?

The daily food intake is the amount of food a dog consumes each day, measured in grams or kilocalories. It is determined by the dog’s individual energy requirements, the energy density of the food, and the goal of maintaining or building muscle mass. A properly calculated daily food intake meets the dog’s needs for energy, protein, fat, minerals, and vitamins without under- or overfeeding the dog.

Important: The feeding guidelines on the package are for reference only. Actual dog requirements can vary significantly depending on metabolism, spay/neuter status, activity level, and breed. Studies show that package recommendations often significantly overestimate a dog’s needs.

Background and Academic Context

The energy requirements of an adult dog are calculated in kilocalories per day. The FEDIAF (European Pet Food Industry Federation) and the NRC (National Research Council) provide the technical standards for this. The rule of thumb for the maintenance requirements of a normal-weight, moderately active, neutered dog is: 95 times body weight raised to the power of 0.75 kilocalories per day. For a 20-kilogram dog, this amounts to approximately 900 kilocalories.

In a prospective cohort study, Salt et al. (2019) demonstrated that being overweight shortens life expectancy by up to two years, depending on the breed. German et al. (2017) found that over 50 percent of dogs in industrialized countries are overweight. Obesity increases the risk of osteoarthritis and tumors.

The Body Condition Score (BCS) is the internationally recognized scale for assessing nutritional status. On a 9-point scale, a score of 4 to 5 is considered ideal: ribs are palpable but not visible, a clearly defined waist is visible from above, and the abdominal muscles are visible from the side.

Vitomalia-Position

We recommend calculating the amount of food based on the dog’s individual needs rather than the package size. Determine the maintenance requirement using the FEDIAF formula, assess the body condition score every two to four weeks, and adjust the amount accordingly. We do not condone owners feeding their dogs more than they need out of a sense of guilt or as a way of showing affection. Being overweight is not a sign of care, but a preventable risk factor.

We strongly recommend including all snacks and treats in your dog’s daily intake. During active training, training treats can quickly account for 20 percent of the daily ration.

When does the amount of food a dog eats become important?

Adjustments are needed during several phases: Puppy growth (increased needs, controlled increase via daily rations), neutering (metabolism decreases by about 20 percent), pregnancy and lactation (needs up to four times higher), senior age (often decreasing needs, protein quality more important), illness (individual, to be clarified by a veterinarian), and changes in activity level (athletic dog vs. couch potato). Climate also plays a role: requirements increase in cold weather and decrease in hot weather.

Practical application

Calculate maintenance requirements: 95 times body weight raised to the power of 0.75. For neutered or calm dogs, use a factor of 80 to 85. For active dogs, use a factor of 110 to 130.
Check the energy density of the food: The packaging lists the metabolizable energy per 100 grams. Divide the daily requirement in kilocalories by this density to get the number of grams.
Assess the Body Condition Score regularly: every two to four weeks. If the BCS increases, reduce the amount by 10 percent. If it decreases, increase the amount by 10 percent.
Divide the daily portion sensibly: two meals for adult dogs, three to four for puppies (see feeding guidelines).
Include treats: Treats should make up no more than 10 to 15 percent of the daily ration. Subtract this amount from the main meal.
Weigh instead of estimating: Volume measurements are inaccurate. A kitchen scale is the simplest investment you can make for your diet.

Common Mistakes and Myths

"The package says how much I should feed." According to several studies, the feeding guidelines on the package often significantly overestimate the actual amount needed.
"My dog is hungry, so he needs to eat more." Hunger isn't the same as need. Many dogs eat far more than their energy requirements.
"Being a little overweight doesn't hurt." Salt et al. (2019) clearly demonstrate that even moderate overweight shortens life expectancy.
"Dry food and wet food are the same in terms of volume." False. Wet food contains 70 to 80 percent water, while dry food contains 8 to 10 percent. Per gram, dry food has about three times the energy density.
"My dog only eats once a day, and he's doing fine." In some breeds, Eat infrequently can increase the risk of gastric torsion (see Gastric Torsion).

State of the art in 2026

The evidence regarding feed intake is robust. FEDIAF nutrient requirements are updated regularly. Consensus: Individualized adjustments are preferable to one-size-fits-all recommendations; BCS monitoring is the gold standard; and obesity is one of the most common preventable diseases in dogs. Open questions concern the role of the microbiome in energy utilization and genetic differences in basal metabolic rate among breeds.

Frequently Asked Questions

How much food does a 10-kilogram dog need?

Daily caloric requirement is approximately 540 kilocalories, depending on activity level and spay/neuter status. For a dry food with 360 kilocalories per 100 grams, this amounts to about 150 grams per day.

How can I tell if my dog is eating too much?

Body Condition Score above 5 out of 9; ribs difficult to palpate; no visible waist when viewed from above; sagging abdomen. Weight is objectively assessed during a veterinary examination.

Should I feed by volume or by weight?

Always by weight. Density values, such as those for cups, can vary by up to 30 percent.

What should you do if your dog is always hungry?

Have your pet examined by a veterinarian (thyroid, diabetes), try a diet with a higher fiber content, and spread the daily portion across more meals.

Related terms

Sources and further reading

Salt, C., Morris, P. J., Wilson, D., Lund, E. M., & German, A. J. (2019). Association between life span and body condition in neutered client-owned dogs. Journal of Veterinary Internal Medicine, 33(1), 89-99.
German, A. J., Holden, S. L., Wiseman-Orr, M. L., et al. (2017). Quality of life is reduced in obese dogs but improves after successful weight loss. The Veterinary Journal, 192(3), 428-434.
FEDIAF (2024). Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs. European Pet Food Industry Federation, Brüssel.
National Research Council (2006). Nutrient Requirements of Dogs and Cats. The National Academies Press, Washington DC.
Linder, D. E., & Mueller, M. K. (2014). Pet obesity management: beyond nutrition. Veterinary Clinics of North America: Small Animal Practice, 44(4), 789-806.