The couch-potato problem in pet food labels

Short answer: nutrient profiles are written per 1000 kcal. Two dogs of the same weight can have very different calorie needs — so the sedentary one eats less food, and takes in proportionally fewer vitamins and minerals, from a bag labelled complete and balanced. FEDIAF in Europe publishes separate profiles for active and inactive animals. AAFCO in the US publishes one. This is not our observation; a US consumer advocate put it to AAFCO in 2018.

The two dogs

Take two five-year-old, ten-kilogram dogs. One is busy and burns around 400 kcal a day. The other lives on a sofa and walks to the garden and back, so it needs around 300 kcal. A hundred calories apart, same animal on paper.

Their requirement for calcium, though, is not a hundred calories apart. Nor is their requirement for zinc, iodine, copper or vitamin A. Those track body size and physiology far more closely than they track how much the dog ran about.

Now feed both the same food. The label says complete and balanced, and it is telling the truth — as measured per 1000 kcal. But the sofa dog eats 25% less food, so it takes in about 25% less of everything in it. Susan Thixton, Truth About Pet Food (2018) laid this out with exactly this example and asked AAFCO to address it.

And it cuts both ways, which is the part usually left out: the active dog eating more food to meet its energy need is taking in more vitamins and minerals than its body size calls for. One end of the problem is a shortfall; the other is a slow surplus.

Why the per-1000-kcal denominator is right and still leaves a gap

Wondering how this applies to your own pet? Build their bowl — two minutes, and it gives the exact grams for their weight.

Stating requirements per unit of energy is not a mistake. It is the only sane way to write a specification for a food that will be eaten by a chihuahua and a mastiff, and we use the same denominator ourselves — our own nutrient table is built per 1000 kcal ME, and calls that the only valid basis.

The gap is not in the denominator. It is that a single adult profile assumes a single relationship between energy intake and nutrient need, and then one label has to serve animals whose energy intake differs by a third.

Europe already fixed this

The clearest evidence that the objection is real is that a major regulator acted on it. The FEDIAF Nutritional Guidelines publish adult profiles tiered by energy requirement:

Adult profiles	FEDIAF (Europe)	AAFCO (US)
Dogs	Two: one based on a MER of 110 kcal/kg BW (active), one on 95 kcal/kg BW (inactive)	One: “Adult Maintenance”
Cats	Two: 100 kcal/kg BW (active) and 75 kcal/kg BW (inactive)	One: “Adult Maintenance”

Read what that design implies. A profile for a low-energy cat specifies higher nutrient concentrations per 1000 kcal than the high-energy one. That only makes sense if the requirement is anchored to the animal rather than to its calories — which is precisely the point at issue. Europe did not just add a tier; it conceded the principle.

Where we would soften the argument slightly. It is not quite true that nutrient needs are wholly independent of energy intake — several B vitamins are cofactors in energy metabolism and do scale with throughput. The honest statement is that most minerals and fat-soluble vitamins are far more closely tied to body size than to activity, which is enough for the argument to stand, and is what the FEDIAF tiering reflects.

The Indian version of this problem is worse

Most of India's urban pet population is exactly the animal this fails: a neutered, indoor, apartment-dwelling dog or cat with a low energy requirement. Neutering lowers energy needs while appetite stays put, so the owner — correctly — feeds less to keep the weight down.

Every responsible portion cut is also a nutrient cut. That is the trap. The owner doing the right thing about their pet's waistline is, without knowing it, thinning out the micronutrients too. And they will never see it, because nutrient deficiency is not visible for a year or more.

How we handle it, and you can check this one

This is the failure mode our system is built around, and the fix is structural rather than clever: we do not carry the micronutrients in the food.

Our correction is a sachet dosed on body weight alone. In the code that computes it, the dose function takes one argument — the animal's weight in kilograms — and returns a sachet count and pack size. The activity setting is not passed to it, because it has no business being there.

The activity slider does something different: it changes the food. A sedentary 10 kg dog is told to serve less meat than an active one, because it needs fewer calories. What does not change is the number of sachets, because its skeleton, thyroid and immune system did not get smaller when it stopped running about.

Energy tracks activity. Micronutrients track the animal. That is the same separation FEDIAF makes with two profiles, arrived at from the other direction — and it is why an owner can cut portions for weight control without quietly cutting the nutrition with them.

The floors themselves come from NRC 2006, same as everyone's. What we add is that the dose is not hostage to the appetite. Build your pet's bowl →

References

Susan Thixton, Truth About Pet Food (2018). Complete and Balanced? Maybe…Maybe Not. Published 5 February 2018.
FEDIAF Nutritional Guidelines. Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs — adult maintenance profiles tiered by metabolisable energy requirement.
Association of American Feed Control Officials. Dog and Cat Food Nutrient Profiles — single adult maintenance profile per species.
National Research Council (NRC). Nutrient Requirements of Dogs and Cats. Washington, DC: National Academies Press; 2006.

The couch-potato problem: “complete and balanced” depends on how much your pet eats