How many calories does my dog need a day?

On this page

1. RER: the resting number
2. MER: the multiplier table
3. Worked examples
4. Use ideal weight, not current
5. Treats and the 10 percent rule
6. Where walks fit (small)
7. Estimates vary up to 50 percent: watch the trend

A dog's daily calorie need starts with the resting energy requirement, RER = 70 × (ideal weight in kg)^0.75, then multiplies by a life-stage factor: 1.6 for a typical neutered adult, 1.8 intact, 1.2 to 1.4 for low-activity or weight-prone dogs, 2.0 for puppies over four months and light work, 3.0 for puppies under four months. A 25 kg neutered adult: RER about 783 kcal, maintenance about 1,250 kcal a day. Use the ideal weight, count treats inside the total, and expect the real dog to sit anywhere within about 50 percent of the estimate.

RER: the resting number

The resting energy requirement is what a healthy dog burns lying quietly in a warm room: breathing, digesting, keeping warm, keeping cells alive. It scales with body weight to the 0.75 power rather than in a straight line, a relationship known as Kleiber's law that holds from mice to elephants. In practice: a 5 kg dog needs about 234 kcal at rest, a 25 kg dog about 783, a 40 kg dog about 1,113. Doubling the dog does not double the calories, which is why small dogs eat so much for their size.

The National Research Council's 2006 nutrient requirements are the primary source; the WSAVA Global Nutrition Toolkit and AAHA's 2021 guidelines carry the same formula into practice. A linear shortcut, 30 × kg + 70, is often quoted and is fine for mid-sized dogs, but it overestimates tiny dogs and underestimates giants, so the exponent version is the one to use.

MER: the multiplier table

The maintenance energy requirement is RER scaled for how the dog actually lives. These are the WSAVA multipliers, the same table Pawdometer uses:

Worked examples

Daily maintenance calories for ideal weights from 5 to 40 kg, computed with the formulas above (the calorie needs calculator does any weight):

Read the neutered-adult row for a typical pet: 5 kg about 375 kcal, 10 kg about 630, 20 kg about 1,060, 30 kg about 1,435, 40 kg about 1,780. A 10 lb (4.5 kg) dog, the example on many vet handouts, has an RER of about 218 kcal and a neutered-adult need of about 350.

Use ideal weight, not current

This is the rule most often broken. If a dog whose ideal weight is 25 kg currently weighs 30 kg and you compute the need at 30, you get about 1,460 kcal instead of 1,250, and the dog is fed to stay 5 kg overweight forever. Compute at the ideal. If you do not know the ideal, the condition-score method in How much should my dog weigh? estimates it, and your vet confirms it.

Treats and the 10 percent rule

Treats, chews, training rewards and whatever falls off the table all count, and should stay under about 10 percent of the day's calories so the main food keeps the diet balanced. For a 1,250 kcal dog that is 125 kcal: three medium biscuits, or one dental chew, or a slice of cheese. Most owners who "only give a few treats" are over it by lunchtime, which is the single most common reason a dog gains weight on a correctly calculated ration.

Where walks fit (small)

A walk burns about 0.8 to 1.0 kcal per kilogram per kilometre: for the 25 kg dog above, a 3 km walk is 60 to 75 kcal, roughly 5 percent of the day. It is a real contribution and a small one, which is why weight plans lean on portions and use walking for muscle, joints and habit. The working is in How many calories does a dog burn on a walk? and the plan that combines the two is Helping your dog lose weight by walking: an 8-week plan. Dogs who genuinely work or run for hours move up a multiplier band instead.

Estimates vary up to 50 percent: watch the trend

The Pet Nutrition Alliance's reference sheet is blunt about it: individual dogs can need up to 50 percent more or less than the calculated MER. Metabolism, coat, temperament and climate all move the number. So the formula sets the starting ration, and the scale and the ribs decide whether it was right. Weigh monthly (weekly during a plan), score body condition, and adjust by about 10 percent at a time. That feedback loop, not the formula, is what vets actually rely on. None of this is feeding advice for your dog; it is the arithmetic your vet starts from, and the conversation about the actual ration belongs with them.

Frequently asked questions

How many calories should a 50-pound dog eat?

A neutered adult at an ideal 50 lb (22.7 kg) has a resting requirement of about 730 kcal and a maintenance need of about 1,170 kcal a day; an intact adult about 1,310; a weight-prone or low-activity dog 875 to 1,020. Individual dogs vary by up to 50 percent, so the number is a start and body condition is the feedback.

What is RER for dogs?

Resting energy requirement: the calories a dog burns at rest in a comfortable environment, about 70 times ideal body weight in kilograms raised to the 0.75 power. It is the base that every other requirement is multiplied from.

Is the 30 × kg + 70 formula accurate?

It is a linear approximation of the exponent formula and is reasonable for dogs between roughly 2 and 45 kg. Outside that range it drifts, which is why WSAVA and the app use the exponent version.

Why is my dog gaining weight on the recommended amount?

Because the recommendation is an average and your dog is an individual; because treats and table food are rarely counted; and because the amount was probably set for the current weight rather than the ideal. Recompute for the ideal weight, count everything, and let a monthly weigh-in be the judge.

This guide is general information from published veterinary and scientific sources, not veterinary advice. Every dog is different: for exercise, weight or feeding decisions, talk to your vet. Pawdometer never gives diet advice.