How Much Should I Feed My Dog? Complete Portion Guide by Weight & Age

Look down at your dog’s ribs right now. Can you feel them easily under a thin layer of fat, or do you have to press to find them? Over half of US dogs are overweight, and most of their owners genuinely don’t see it — weight creeps on slowly enough that “a little chunky” starts to look normal. The fix isn’t a diet; it’s just measuring correctly, which almost nobody actually does.

The Formula Vets Actually Use

Feeding amounts printed on kibble bags are rough averages, not calculated for your specific dog. The more accurate starting point is Resting Energy Requirement (RER):

RER = 70 × (body weight in kg)^0.75

From there, multiply by a lifestyle factor:

• Adult neutered dog, average activity: RER × 1.6
• Puppy under 4 months: RER × 3.0 (rapid growth needs far more energy per kg than an adult)
• Senior dog: RER × 1.4 (metabolism slows, and many seniors are also less active)
• Weight loss goal: RER × 1.0 — discuss with your vet before restricting an already-underweight dog

Most dry kibble runs 300–400 kcal per cup, but this varies meaningfully by brand and formula — always check the actual label rather than assuming.

Feeding Guide by Weight

Dog Weight	🔥 Daily Calories	🥣 Dry Food
5 kg (11 lbs)	~295 kcal	¾–1 cup
10 kg (22 lbs)	~495 kcal	1¼–1½ cups
20 kg (44 lbs)	~835 kcal	2–2½ cups
30 kg (66 lbs)	~1,120 kcal	2¾–3¼ cups
40 kg (88 lbs)	~1,385 kcal	3½–4 cups

Treat this table as a starting point, then adjust based on what you actually see on your dog’s body over the following 2–3 weeks — the formula gets you close, your dog’s ribs and waistline get you exact.

Body Condition Scoring: The 30-Second Check

Numbers on a chart don’t know your dog’s actual body — a quick hands-on check does. With your dog standing, run your hands along their sides: you should feel ribs easily with light pressure, not see them, and not have to dig for them either. Look from above: there should be a visible waist tuck behind the ribs. No tuck, or ribs you can’t feel without pressing hard, both signal it’s time to recalculate — usually downward. Do this check monthly; it catches slow weight drift long before it becomes an obvious problem.

How Many Meals a Day

• Puppies, 8–12 weeks: 4 meals/day
• Puppies, 3–6 months: 3 meals/day
• Dogs, 6 months to adult: 2 meals/day
• Senior dogs: 2 smaller meals/day

Splitting daily food into two or more meals — rather than one large one — is also linked to a lower risk of bloat (GDV) in large, deep-chested breeds, alongside keeping blood sugar and energy more stable through the day.

Wet vs. Dry Food: How to Actually Convert Between Them

Wet and dry food aren’t interchangeable cup-for-cup, because canned food is roughly 75–80% water while kibble is closer to 10%. That means wet food is far less calorie-dense by volume — a typical 13-oz can of wet dog food runs somewhere around 350–450 kcal, while the same weight in kibble can pack close to double that. If you’re mixing the two, or switching a dog fully from one to the other, convert by calories, not by cup or can size: check the kcal/kg or kcal-per-can figure on both labels, then split your dog’s daily RER-based target between them proportionally. A common mixed-feeding approach is roughly 75% of daily calories from kibble and 25% from wet food added for palatability or hydration — adjust the kibble portion down to compensate, not just add wet food on top of a full kibble ration.

Worked example: a 20 kg dog with a daily target of ~835 kcal eating half wet, half dry would need roughly 420 kcal from each. If the wet food is 400 kcal per 13-oz can, that’s close to one full can, plus enough kibble (at, say, 350 kcal/cup) to make up the remaining ~420 kcal — a bit over 1 cup. Always calculate from the actual kcal figure printed on your specific product, since brands vary widely even within the same food type.

Feeding a Senior Dog with Kidney Concerns

Chronic kidney disease becomes more common as dogs age, and diet is one of the few things owners can meaningfully control once a diagnosis is made. The general clinical pattern — and this is genuinely a “talk to your vet first” area, not a DIY project — is that dogs in the later stages of kidney disease often do better on food with moderately restricted, high-quality protein and reduced phosphorus, since the kidneys are what clear protein metabolism byproducts and excess phosphorus from the blood. Restricting protein in an early-stage or healthy senior dog isn’t automatically beneficial and can backfire by contributing to muscle loss, so this is not something to pre-emptively apply to every aging dog. If bloodwork shows elevated kidney values, ask specifically about a prescription renal diet and staged monitoring — the right protein target depends on which IRIS stage of kidney disease your vet identifies, not a blanket rule. Our senior dog care guide covers the broader picture of aging-related health monitoring.

Switching Foods Without the Upset Stomach

A sudden food change is one of the most common, entirely preventable causes of vomiting and loose stool in dogs. The gut’s bacterial population adapts to whatever it’s been digesting consistently, and a same-day swap doesn’t give it time to catch up. Use a 7–10 day transition, gradually shifting the ratio:

• Days 1–2: 75% old food, 25% new food
• Days 3–5: 50% old food, 50% new food
• Days 6–8: 25% old food, 75% new food
• Days 9–10: 100% new food

Dogs with sensitive stomachs, or those switching between very different formulas (say, a grain-inclusive kibble to a novel-protein limited-ingredient diet), often do better stretching this to 14 days. If loose stool shows up partway through, hold at the current ratio for a couple of extra days instead of pushing forward on schedule.

How to Actually Read a Pet Food Label

Two numbers on the bag matter more than the marketing copy around them:

• Guaranteed Analysis — lists minimum crude protein and crude fat, plus maximum crude fiber and moisture, expressed on an “as-fed” basis (meaning water content isn’t stripped out). This is why comparing the guaranteed analysis of a wet food directly against a dry food is misleading — a wet food’s protein percentage looks lower purely because so much of its weight is water.
• The AAFCO Nutritional Adequacy Statement — usually a small line reading something like “formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles for [life stage],” or that the product was tested via AAFCO feeding trials. This is the line that actually confirms a food is complete and balanced enough to be a dog’s sole diet, rather than a treat or supplemental food — always check that it’s present and matches your dog’s current life stage (growth, adult maintenance, or “all life stages”).

Ingredient lists, by contrast, are ordered by pre-cooking weight and are far easier for marketing to game (splitting a single ingredient into several sub-categories to push it lower on the list, for instance) — useful for spotting allergens, but a weaker signal of overall quality than the two figures above.

Free-Feeding vs. Scheduled Feeding

Leaving a full bowl out all day (free-feeding) is convenient, but it removes your ability to notice one of the earliest signs of illness: a sudden drop in appetite. With scheduled meals, a skipped meal is an obvious, immediate signal; with free-feeding, a sick dog can quietly eat less for days before anyone notices the bowl isn’t emptying as fast. Free-feeding also makes portion control effectively impossible to enforce, since it’s difficult to track exactly how much of a continuously topped-up bowl any one dog actually ate — a real problem in multi-dog households. Scheduled feeding — set meals at set times — supports both weight management and early illness detection, and is the better default for most dogs, with free access reserved mainly for very young kittens or specific medical situations under vet guidance (this article covers dogs, but the same appetite-monitoring logic applies across species).

Why Some Dogs Never Seem to Feel Full: The Labrador Gene

If you’ve ever owned a Labrador Retriever that acts starving five minutes after a full meal, there’s real genetics behind it, not just enthusiasm. A 2016 study published in Cell Metabolism identified a deletion in the canine POMC gene — found in roughly 1 in 4 Labradors — that disrupts hormone signaling involved in appetite regulation and satiety. Dogs carrying the variant showed measurably greater food motivation and a higher risk of obesity, independent of how much they were actually fed. Interestingly, the same study found the mutation was even more common in Labradors selected specifically as assistance dogs, since food motivation is a trait trainers actively select for. The practical takeaway: if your Lab (or closely related Flat-Coated Retriever) seems perpetually hungry, that’s a real physiological signal worth managing with strict portion control and slow-feeder bowls rather than a cue to simply feed more.

Foods That Don’t Belong in the Bowl

• 🚫 Chocolate — contains theobromine, toxic in doses that scale with your dog’s size and the chocolate’s cocoa content
• 🚫 Grapes and raisins — linked to acute kidney failure, even in small amounts, for reasons still not fully understood
• 🚫 Onions and garlic — damage red blood cells; risk builds with repeated small exposures, not just one large dose
• 🚫 Xylitol — a sugar substitute in sugar-free gum and some peanut butters; causes a dangerous, rapid blood sugar crash
• 🚫 Macadamia nuts — cause weakness, vomiting, and tremors within hours
• 🚫 Avocado — contains persin, toxic to dogs in meaningful quantities

For the full breakdown of quantities and severity, see our complete toxic foods list.

Treats: The Calories Owners Forget to Count

Treats should stay under 10% of total daily calories — easy to say, easy to blow through without noticing, since a few training treats here and a shared bite of your sandwich there add up faster than the kibble measurement does. If you’re free-feeding treats throughout the day, that “10%” is worth subtracting from the base RER calculation, not adding on top of it.

Frequently Asked Questions

Should I feed by the bag’s suggested amount or the RER formula?

The RER formula, adjusted by your dog’s actual body condition, is more accurate — bag recommendations are generic averages calibrated to sell more food, not tailored to your dog’s specific metabolism and activity level.

My dog always acts hungry even at the “right” amount — is that normal?

Some breeds (Labradors especially) have a genetic tendency toward high food motivation regardless of actual caloric need. Confirm your dog’s weight is stable or appropriate before increasing food — acting hungry isn’t the same as being underfed.

How often should I recalculate the amount?

Recheck after any weight change, at each life stage transition (puppy to adult, adult to senior), and any time you switch food brands, since calorie density varies between products even at the “same” cup measurement.

How long should transitioning to a new food take?

7–10 days for most healthy dogs, stretched to about 14 days for dogs with sensitive stomachs or when switching between very different formulas — go slower, not faster, if you see loose stool partway through.

Is wet food better than dry food, or vice versa?

Neither is universally “better” — both can be nutritionally complete if they carry an AAFCO adequacy statement matching your dog’s life stage. Wet food adds hydration and tends to be more palatable for picky eaters or dogs with dental discomfort; dry food is more calorie-dense, generally cheaper per calorie, and helps some dogs’ dental hygiene through chewing action. Many owners land on a mix of both for exactly these complementary reasons.

Get Your Dog’s Exact Portion

Skip the manual math — our free Pet Food Portion Calculator factors in weight, age, activity level, and health status for a personalized daily feeding plan.

🛠️ Free Tools: Pet Food Portion Calculator  ·  Pet Age Calculator