How much should you actually feed your dog? The formula vets use (not the bag)

The feeding chart on the back of the bag is the least personalized piece of advice you'll get about your dog. It assumes an "average" dog of that weight — not neutered-vs-intact, not your dog's actual activity level, not the specific calorie density of that bag's formula. It's a starting guess, dressed up as a table.

Veterinary nutritionists use something more specific: a two-step calorie formula. It's still an estimate — more on that below — but it's a much better one, and it's the same math a vet would do.

Step 1: Resting Energy Requirement (RER)

This is roughly how many calories your dog burns just existing — breathing, circulating blood, keeping organs running — with zero activity.

RER = 70 × (body weight in kg) ^ 0.75

For a 10 kg dog: 70 × 10^0.75 ≈ 70 × 5.62 ≈ 394 kcal/day at complete rest.

You don't need to do the exponent by hand — any calculator app has a "x^y" button, or you can look up an RER table online. The point is what the number means, not the arithmetic.

Step 2: Multiply by a life-stage/activity factor

RER alone underestimates real needs, because your dog isn't lying still all day. Multiply RER by a factor based on their status:

• Weight loss goal: 1.0× RER
• Neutered/spayed adult, normal activity: 1.6× RER
• Intact adult, normal activity: 1.8× RER
• Low-activity / mostly indoor: as low as 1.2× RER
• Working or very high-activity dog: 2.0–5.0× RER
• Puppies need considerably more per kg than adults (growth has its own multiplier, and changes fast as they age) — this guide is for adult dogs.

For that same 10 kg neutered adult dog with normal activity: 394 × 1.6 ≈ 630 kcal/day.

Turning calories into grams

Calories per day only becomes a feeding amount once you know the calorie density of your food — check the "kcal/kg" or "kcal per cup" figure on the bag (not just the generic feeding chart). Divide your daily calorie target by the food's kcal-per-gram to get the actual grams to feed, then split across meals.

The part that matters more than the formula

Individual dogs vary from this estimate by roughly ±30%, and some sources put real-world variation as high as ±50%. Two dogs, same weight, same neuter status, same activity label, can have genuinely different real needs. That's not a flaw in the formula — it's just what it is: a starting point to weigh, watch, and adjust from, not a number to follow blindly for months.

The practical version: calculate the number, feed it for 2–3 weeks, then actually weigh your dog and look at body condition (can you feel ribs easily under a thin fat layer? Is there a visible waist from above?). Adjust up or down from there. This is exactly why a static number on a bag is worse than a number plus a log — the formula gets you close, the trend line gets you right.

If you'd rather skip the manual math: this is what Kiboo's AI-generated meal plans do automatically — calculated from your dog's actual breed, weight, and activity level, and easy to re-check as their weight trend updates.

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Sources: Resting Energy Requirement and maintenance-energy multiplier ranges are based on veterinary nutrition guidance summarized by AAHA and the WSAVA Global Nutrition Guidelines. This article is general information, not a substitute for guidance from your own veterinarian, especially for puppies, senior dogs, or dogs with a medical condition affecting diet.