Don't read the bag. Read the dog.
The most common question I get about food isn't "which brand?", it's "how much do I give him?". And right after that: "how many times a day?" and "can I change his food?". They're good, practical questions, from someone who wants to do right — and the bag of food, most of the time, gives you the wrong answer to them.
Because the label gives you a portion calculated for an average, theoretical dog that doesn't exist. Your dog has its own age, its own energy, its own metabolism. Two dogs of the same weight can need portions that differ by a third. So here I'm giving you something other than a number: I'm giving you the method by which you work out for yourself how much, how often and how to change its food — by reading the dog, not the packaging.
Part 1. How much? The requirement is a range, not a meter
Let me tell you one thing that will save you a lot of headaches: there is no magic, exact calorie figure for your dog. Anyone who sells you precision down to the kilocalorie is fooling you — the real variation between dogs is far too large for that. What exists is a starting point, which you then adjust.
The starting point is a simple rule you can do in your head: roughly 33 calories a day for every kilogram of its body weight. A 20 kg dog? 20 times 33, so around 660 calories a day. That's it — no complicated formulas.
I say roughly, because it's a starting point, not a law. A young dog, a sporting dog or an intact dog burns more; an older one, a couch dog or a neutered one, less. And one honest thing from the research: the charts on the bags frequently overestimate the portion for the family dog — a study of 165 dogs found a real requirement below what the charts say. In other words: if you give it exactly what the bag says, you're very likely giving it too much.
That's why this figure is the start of a conversation, not a verdict. The verdict comes from the dog's body. And you read that yourself, at home, without scales and without a laboratory.
The real compass: how to "read" your dog
Three simple checks you can do right now, with your hand:
The ribs. Put your palm on its ribcage and press lightly. You should feel the ribs under a thin layer of fat — like the back of your hand, not like your knuckles (that would be too thin), but not hidden under a soft cushion either (that would be too fat).
The waist, seen from above. Look at it from above, standing. Behind the ribs there should be a narrowing — a waist. If it's straight like a barrel, it's too fat.
The belly, seen in profile. The belly line should rise towards the back, not hang horizontally.
If you want something even more objective, measuring the chest and abdomen circumference with a tailor's tape matches the professional assessment well — so you have a tool at home that doesn't lie to you.
An uncomfortable but useful truth: we owners see our dogs as fitter than they are. It's human. That's why the golden rule stays a single one: adjust the portion according to how the dog looks and feels, not according to what the bag says. Feel too many ribs? Increase a little. Can't feel them at all any more? Decrease. The dog is the scale.
Part 2. How often? Less important than you'd think (with one exception)
Here I have news that reassures many people stressed by rules: the number of meals a day, for a healthy adult dog, isn't a big deal.
By life stage, as a guide:
The puppy eats often, in several meals a day — it has small energy reserves and tires easily between meals.
The adult — one or two meals a day.
The senior — usually two smaller meals, for digestive comfort.
What has changed since we believed otherwise
For years the rule taught was "two meals a day, mandatory; a single meal is unhealthy". Well, recent research has turned it around. A study of tens of thousands of dogs found that a single daily meal is associated with better scores for memory and thinking, and with fewer digestive, dental, joint, kidney and liver problems. Another, controlled study found no difference in digestion or blood sugar between one meal and two.
Honest to the end: these are associations, not proof of causation — it doesn't mean the single meal "cures", but that it isn't dangerous the way people thought. The practical conclusion for you: relax about the number of meals; what matters is the right total amount and a dog in good shape.
The only exception that stays serious: large-breed dogs
There is one situation in which the number and kind of meals really do matter: bloat with gastric torsion (an emergency in which the stomach swells and twists). It's a real and serious problem, especially in large-breed dogs — the molossers (Cane Corso, Rottweiler, Mastiff), the Great Dane, the large shepherds, the Dobermann — for them the lifetime risk isn't negligible, and the emergency is fatal if you don't get to the vet quickly.
What is well established as a precaution for these breeds: split the meal into several portions, don't let it wolf its food down, and avoid intense exertion straight after a meal. An interesting detail from the research: in large dogs, the size of the kibble mattered more (larger pieces, which force the dog to chew, were associated with lower risk) than the number of meals itself.
What is still debated, not law: exactly how much the height of the bowl or the walk after a meal weigh in triggering torsion. We teach these as "reasonable caution", not as certainties.
So, in short: if you have a large-breed dog — a molosser (Cane Corso, Rottweiler), a Great Dane, a large shepherd, a Dobermann — split the meal and be careful with exertion afterwards. If you have a small or medium-sized dog — breathe easy, the number of meals isn't your battle.
Part 3. How do you change food? Slowly, for a reason that has to do with calm
We get to the part most well-meaning people get wrong: changing food overnight. You buy a new, better bag and put it in the bowl the very next day, all of it. The result, often: soft stool, gas, an upset stomach — and a dog that seems to have "not tolerated the good food". In fact it wasn't the food. It was the speed.
Here's why, and this is the core that links the gut to behaviour:
In the dog's gut lives a huge population of good bacteria — a small factory. It doesn't just help digestion; it produces substances that feed the intestinal wall and takes part in producing the molecules linked to a state of calm (along the serotonin pathway). When you change food abruptly, you turn this factory upside down overnight. In one study, an abrupt change lowered the intestinal markers linked to serotonin and raised other compounds associated with discomfort; a gradual change, on the contrary, reduced diarrhoea and increased beneficial bacteria.
Here I have to be honest with you, as always: the link "unsettled gut — dog that's harder to train" makes solid biological sense, but in dogs it is for now a reasonable deduction, not something demonstrated on behaviour. I'm not selling you a miracle. I'm telling you the logic: a dog whose stomach is fine is a more comfortable dog, and a comfortable dog is easier to keep calm and to train. What you do in the bowl and what you do on the leash push in the same direction.
The good news: the gut flora adapts quickly if you give it time. After a change of diet, it rearranges itself within a few days and then stabilises — exactly the window you protect with a 7-10 day transition.
The practical transition plan (10 days)
Days 1-3: three quarters old food, one quarter new food (75% old / 25% new).
Days 4-6: half old, half new (50% / 50%).
Days 7-9: one quarter old food, three quarters new (25% old / 75% new).
Day 10: fully on the new food (100%).
For a dog with a sensitive stomach, stretch each step by a few extra days — it's not a race.
The signs that tell you to stop or slow down: soft stool or diarrhoea, a lot of gas, a bloated belly, itching or redness of the skin, loss of appetite. If they appear, go back to the previous step for a few days, then move on more slowly. Hurrying doesn't pay off here.
The analogy that helps you feel it: it's like when you suddenly travel to another country and switch overnight to a completely new cuisine — your stomach protests for a few days, not because the food is bad, but because it's new. You give your body time to get used to it, and everything goes back to normal.
The one-minute summary (if you remember only one thing)
How much: start from the rule, but dose according to how the dog looks — ribs easy to feel, visible waist. The dog is the scale, not the bag.
How often: for the ordinary dog, the number of meals doesn't matter much — the total amount does. Exception: large-breed dogs (molossers, Great Dane, large shepherds), where you split the meal and avoid exertion straight after.
How you change: gradually, over 7-10 days, following the plan. A stomach changed slowly is a calmer stomach (and a calmer dog).
Why I'm telling you all this
Why is a behaviour and training man talking to you about portions and transitions? Because I see them linked in the field, day after day. A dog that's fed badly or whose stomach is always upset is a dog that's harder to train — the agitation comes from below, from the stomach. A nervous system that's fed sensibly is a nervous system you can actually educate. How much you put in the bowl and how you put it there aren't a matter separate from training — they're its foundation.
If you want to understand why everything you've read here works, the first step is KNESsence, the free material in which I've put the essence of the system we work by at KNES. Create an account on knes.ro, you'll get a six-digit code by email and go straight to it.
With care for your dog,
Petre ROMAN
This material is for educational purposes and does not replace a consultation with a veterinarian. Calorie requirements and any change of diet, especially for a dog with health problems or a breed at risk of bloat, should be discussed with your veterinarian first.
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