Dog Nutrition Decoded: How to Read a Dog Food Label and Choose Well

The problem

Why choosing a dog food is harder than it should be

The rules change at the border. The same words on a bag mean different amounts of meat in Europe and in the US. The EU tiers come from the FEDIAF Code of Good Labelling Practice, the industry code endorsed by EU authorities; the US tiers from AAFCO’s labelling rules:

• “Chicken Dog Food”, “Chicken Dinner”, “Chicken Menu”

  EU: at least 26% chicken for all three. US: “Chicken Dog Food” needs at least 95% chicken (excluding added water); “Dinner”, “Entrée” or “Platter” at least 25%.

• “Rich in chicken”, “High in chicken”, “Extra chicken”

  EU: at least 14%. The US has no equivalent tier.

• “With chicken”

  EU: at least 4%. US: at least 3%.

• “Chicken flavour”

  EU: more than 0% but less than 4%, and the flavouring must be declared. US: enough to be detected. Neither sets a meaningful meat minimum.

A bag imported from the US and one made in Romania can use identical wording and contain very different amounts of chicken. The most visible words carry the least meaning: the WSAVA Global Nutrition Committee calls terms like “holistic” and “premium” unregulated and of little practical value. And everyone has an opinion — breeders, influencers, shop staff, forums — while trends such as grain-free spread faster than the science behind them. In 2018 the US FDA began investigating reports of a heart disease, dilated cardiomyopathy (DCM), in dogs eating grain-free diets rich in peas and lentils. No cause has been proven; still, a trend sold as healthier ended up under a federal investigation.

Chapter 1

The six pillars of dog nutrition

Every dog food, from a budget kibble to a chilled fresh meal, is built from the same six elements. Once you know what each one does, marketing claims become much easier to judge.

• 1. Water — how much does a dog need?

  The MSD Veterinary Manual puts the need at roughly 44 to 66 ml per kg of body weight per day in a thermoneutral environment, from all sources combined — about 0.9 to 1.3 litres for a 20 kg dog. Dry food is about 10% water, wet food 75 to 80%, so a dog on wet food drinks less from the bowl, and that is normal. Heat, exercise and nursing raise needs; a sudden, lasting increase in drinking with no obvious reason is worth a vet visit, as it can signal kidney disease, diabetes or hormonal disorders.

• 2. Protein — the building blocks

  Protein builds muscle, skin, coat, enzymes and immune cells. Dogs need ten essential amino acids that they cannot make and must get from food; a shortfall in one limits the use of all the others. Quality depends on how complete the amino-acid mix is and how well it is digested. AAFCO sets at least 18% protein on a dry-matter basis for adults and 22.5% for growth, and the FEDIAF guidelines are in the same range. High-protein diets do not damage healthy kidneys; dogs with diagnosed kidney disease are a different case, for the vet.

• 3. Fat — energy and brain health

  Fat supplies more than twice the calories per gram of protein or carbohydrate and carries vitamins A, D, E and K. Omega-6 (linoleic acid) keeps skin and coat healthy; omega-3 EPA and DHA, mainly from fish oil, support brain and eye development in puppies, and EPA has good evidence for easing arthritis. The trade-off is calories: fatty foods and table scraps are a common route to weight gain, and in some dogs a trigger for pancreatitis.

• 4. Carbohydrates and fibre

  Dogs have no strict dietary requirement for carbohydrate — but that does not make it harmful. Dogs are not wolves: Axelsson and colleagues (Nature, 2013) found that domestication selected for genes of starch digestion, with increased starch digestion in dogs compared with wolves. Cooked grains, potatoes and legumes are a digestible, affordable energy source for most dogs. Fibre works in the gut instead: it firms stools, feeds beneficial bacteria and helps dogs feel full.

• 5. Vitamins and minerals — the tiny workers

  The margin for error is narrow in both directions. Calcium and phosphorus must stay in ratio — FEDIAF sets a minimum of 1:1 and an adult maximum of 2:1 — which matters most in growing large-breed puppies. Excess is real too: in 2018 the FDA warned about toxic vitamin D levels in several dry dog foods, and brands were recalled. Home cooking carries the biggest risk: of 200 published home-made recipes, Stockman et al. (JAVMA, 2013) found 95% short of at least one essential nutrient.

• 6. The golden rule — look for “complete”

  Under EU Regulation 767/2009, complete feed is sufficient for the daily ration on its own; complementary feed (toppers, treats, many mixers) must be fed alongside other food. In the US, look for “complete and balanced” in the AAFCO statement for the named life stage. A food without this statement is not a full meal, however premium it looks — and “complete” is a legal minimum, not a quality guarantee.

Chapter 2

How to read a dog food label (without a chemistry degree)

A dog food label has four parts that matter: the front, the ingredients list, the analysis numbers and the adequacy statement. The front is marketing. The other three are regulated information, and that is where the truth lives.

The front of the bag. “Premium”, “super-premium”, “gourmet” and “holistic” have no legal definition in the EU or the US. “Natural” has one: the FEDIAF code limits it to ingredients to which nothing has been added and which have had only physical processing — it says nothing about nutritional quality. “Human-grade” is strict in the US, where AAFCO requires every ingredient and the whole process to meet human-food standards; the EU has no specific rule, only the general ban on misleading claims. “Grain-free” means only that no grains are used; they are replaced by other carbohydrates such as peas or potatoes.

The ingredients list. Ingredients are listed in descending order of weight before cooking, which is why owners judge a food by its first five. Three traps: water weight (fresh chicken is about 70% water, so “chicken” listed first can end up a smaller share of the kibble than “chicken meal” listed third); ingredient splitting (“peas, pea protein, pea fibre” can each drop below the meat while peas together are the largest ingredient); and category names such as “meat and animal derivatives”, legal in the EU but less informative — when a pack highlights an ingredient, its percentage must be declared. By-products are not automatically bad: organs such as liver and kidney are often more nutrient-dense than muscle meat.

The analysis numbers and the dry-matter trick. “Analytical constituents” (EU) or “Guaranteed Analysis” (US) list crude protein, fat, fibre, ash and moisture — “crude” refers to the lab method, not ingredient quality. These numbers include water, which makes wet food look far lower in protein than it is. To compare fairly, convert to dry matter:

• Formula

  Dry-matter % = nutrient % on the label ÷ (100 − moisture %) × 100

• Dry kibble: 26% protein, 10% moisture

  26 ÷ 90 × 100 = 28.9% protein on a dry-matter basis.

• Wet food: 9% protein, 78% moisture

  9 ÷ 22 × 100 = 40.9% protein on a dry-matter basis — more than the kibble, though it looked like a third.

Carbohydrates are rarely listed; estimate them as 100 minus protein, fat, fibre, ash and moisture. Calorie content (kcal per kg) is the number that should drive portion size.

The adequacy statement — the most important paragraph on the bag. In the US it comes in two forms. “Formulated to meet the nutrient levels established by the AAFCO Dog Food Nutrient Profiles” means the recipe was checked by calculation or analysis; it does not show how well a dog digests it. “Animal feeding tests using AAFCO procedures substantiate…” means dogs ate it as their only diet and stayed healthy — but the standard adult trial is only 8 dogs for 26 weeks, too short to catch slow problems. The best manufacturers use both. “All life stages” includes puppies; for large breeds look for wording covering dogs of 70 lb (about 32 kg) or more as adults. “For intermittent or supplemental feeding only” means not complete. In the EU the label says complete or complementary, with no feeding-trial statement; reputable makers formulate to the FEDIAF guidelines and say so. If they don’t, ask.

What the label cannot tell you. The WSAVA guidelines on selecting pet foods suggest asking the manufacturer: do you employ a qualified nutritionist (a PhD in animal nutrition, or board certification by the ACVN or ECVCN)? Who formulates the diets? What quality control covers ingredients and finished products? What research do you conduct or publish? A specific answer is a good sign; vague talk of “passion” and “ancestral nutrition” is not.

Chapter 3

Wet vs dry vs raw vs fresh dog food

Any of these formats can feed a dog well, provided the food is complete for your dog’s life stage. The format decides convenience, cost, moisture and risk. The formulation decides nutrition.

• Kibble (dry)

  Low cost · ~10% water · main risk: overfeeding

  Affordable, easy to store and portion, good for puzzle feeders and training. Calorie-dense, so loose scooping leads easily to weight gain. Ordinary kibble does little for teeth; specially designed dental diets can help — look for the VOHC seal — and brushing works best. Keep kibble in its original bag: it carries the batch number you need in a recall.

• Wet (cans, trays, pouches)

  Medium–high cost · 75–80% water · main risk: spoilage once opened

  Very palatable; useful for picky eaters, older dogs with dental pain and weight loss, since water adds volume without calories. Extra fluid is used for dogs prone to certain bladder stones; for kidney disease what matters is a prescription renal diet, wet or dry. Refrigerate leftovers and use within two to three days.

• Raw (BARF and commercial raw)

  High cost · main risks: bacteria and imbalance

  Raw diets are far more likely to carry Salmonella, Listeria and E. coli, which dogs can shed without looking ill — a risk to children, older people, pregnant women and anyone immunocompromised. The US FDA advises against raw pet food. Home-made raw diets often get calcium and phosphorus wrong, dangerous in puppies, and whole bones add broken teeth and blockages. If you choose raw anyway: a commercial product labelled complete, ideally high-pressure processed (HPP), handled like raw meat for your own dinner.

• Fresh and gently cooked

  Highest cost · short shelf life

  Highly palatable and moist; cooking removes most of the bacterial risk of raw. “Fresh” is not a nutrition standard, so confirm the product is labelled complete. Cooking at home is possible only from a recipe built by a veterinary nutritionist.

There is no one-size-fits-all. A complete kibble fed in the right amount beats an expensive fresh diet fed in excess.

Chapter 4

Puppy, adult and senior dog food: what changes

A dog’s nutritional needs change more between puppyhood and old age than at any other point. Size matters too: large and giant breeds grow for longer and age sooner.

• Puppy — building the body for life

  Puppies need more energy, protein and minerals per kilogram than adults. Feed a food labelled for growth or all life stages. Large-breed puppies are sensitive to excess calcium and calories, which raise the risk of hip and elbow problems: use a large-breed puppy food and never add calcium supplements. Keep them lean — slow, steady growth is the goal. Three to four meals a day at first, two by around six months. Switch to adult food around 9–12 months (small breeds), 12–18 months (large) or up to 24 months (giant).

• Adult — maintenance means managing calories

  The biggest risk is not a missing nutrient but a surplus of calories. Feeding guides are averages; neutered or less active dogs often need less. Weigh the food: when Coe and colleagues (Veterinary Record, 2019) asked 100 owners to measure dry food by volume, individual errors ranged from about 48% too little to 152% too much. Check body condition every few weeks and trim portions by about 10% if weight creeps up.

• Senior — needs diverge, so watch closely

  Dogs are usually considered senior from about 7 years (earlier for giant breeds). There is no official nutrient standard for “senior” food in the EU or US, so read the label, not the word. Younger seniors often gain weight; older ones often lose weight and muscle and may need more calories. Healthy older dogs need at least as much good-quality protein to preserve muscle; restriction is for diagnosed conditions, under a vet. Omega-3s from fish oil have the best joint evidence; glucosamine and chondroitin are mixed. Weigh monthly: unexplained weight loss is an early warning sign.

Chapter 5

Red-flag ingredients: what to question, and what is over-feared

Few legal pet food ingredients are dangerous at the levels used, but some deserve a second look. The honest question is not “is this ingredient evil?” but “why is it here, and how much?”

• Artificial preservatives: BHA, BHT, ethoxyquin

  Fats go rancid, so dry foods need a preservative. IARC classes BHA as possibly carcinogenic (Group 2B) from high-dose rodent studies; there is no good evidence of harm at pet-food levels. Ethoxyquin’s EU authorisation as a feed additive was suspended by Regulation (EU) 2017/962. Mixed tocopherols (vitamin E) and rosemary extract are the natural alternatives — check the best-before date, since they shorten shelf life. Avoiding the synthetic three is a reasonable preference, not an emergency.

• Propylene glycol

  Keeps chewy treats moist. The anaemia link is established in cats, and the US bans it from cat food (21 CFR 589.1001). In dogs, regulators consider the amounts used safe, but it usually signals a heavily processed, semi-moist product. Keep such treats away from cats.

• “Fillers”: corn, wheat, soy

  “Filler” has no legal or scientific definition; cooked, these supply energy, protein, fibre and fatty acids. The fair concern: plant proteins such as corn gluten meal can inflate the protein number with a less complete amino-acid set. On allergy, Mueller, Olivry and Prélaud (2016) found the most common triggers in dogs were beef, dairy, chicken and wheat; grain-free is not a treatment, and diagnosis needs a vet-supervised elimination trial.

• Added sugars

  Corn syrup, molasses, caramel, dextrose, sucrose and fructose add empty calories. A little molasses in a complete food is not a crisis; sugar near the top of a treat’s ingredients list is a reason to choose another treat.

• The red flags that matter more than any ingredient

  No “complete” statement on a food sold as a main diet; no manufacturer name, address or contact; no batch number or best-before date; a company that cannot answer the WSAVA questions; and artificial colours, which are there for you — dogs don’t care what colour their kibble is.

Chapter 6

How to switch dog food, how many treats, and safe human foods

The 7-day transition. A dog’s gut bacteria adapt to what it eats, and a sudden switch can cause diarrhoea, vomiting or gas — even when the new food is better:

• Days 1–2

  75% old food · 25% new food

• Days 3–4

  50% old · 50% new

• Days 5–6

  25% old · 75% new

• Day 7

  100% new food. Sensitive dogs: stretch to 10–14 days and pause if stools soften. Call the vet for diarrhoea beyond two days, blood, repeated vomiting, lethargy or refusal to eat. Switch immediately if the food is recalled or your vet says so.

Treats: the 10% rule. The WSAVA guide to treats keeps treats under 10% of daily calories so the complete diet stays balanced. A neutered, moderately active 20 kg dog needs roughly 1,000 kcal a day, so its treat budget is about 100 kcal — one large dental chew, or a tablespoon of peanut butter. Check kcal per piece, set aside part of the daily kibble for training, break treats small, and feed a little less at dinner on heavy-treat days.

Safe human foods, plain and in small amounts: carrots; blueberries; apple without core or seeds; cucumber and green beans; cooked, boneless, unseasoned chicken or turkey; fully cooked eggs; plain rice and plain pumpkin purée (not pie filling); peanut butter only without xylitol.

Dangerous, even in small amounts: grapes, raisins and sultanas; onions, garlic, leeks and chives; chocolate and cocoa; xylitol (also “birch sugar” or E967); macadamia nuts, alcohol, caffeine and raw yeast dough; cooked bones. The full list is in our guide to foods and plants toxic to dogs and cats. If your dog eats any of these, contact your vet straight away — don’t wait for symptoms, and don’t induce vomiting unless a vet tells you to. What to do in the first minutes.

Conclusion

Trust your eyes, not just the bag: the monthly checklist

The best test of any diet is the dog eating it. A few minutes a month is enough.

• 1. Body condition — can you feel the ribs?

  On the WSAVA 9-point scale, 4 to 5 is ideal: ribs felt easily under a thin fat layer, a visible waist from above, a belly that tucks up from the side. Ribs hard to feel, straight sides or a level belly mean overweight; ribs visible from a distance and prominent hip bones may mean too thin.

• 2. Muscle

  Feel along the spine, shoulders and back legs. Muscle loss can happen even in overweight dogs and is common in seniors.

• 3. Energy

  Alert, playful, normal recovery after walks. Lasting tiredness is not “just age” until a vet has checked.

• 4. Skin and coat

  A healthy sheen, no flakes, redness, odour or constant itching. A dull coat can reflect diet, but also parasites, allergies or hormones.

• 5. Stool

  Firm, log-shaped, easy to pick up, once or twice a day. Our poop report card explains what the stool is grading.

Lean body, good energy, shiny coat and solid stools: your feeding is very likely working. One honest caution: some diet-related problems stay invisible for months — early kidney disease, the heart disease investigated in some grain-free diets, skeletal problems in large-breed puppies. A yearly vet visit with weight and body condition recorded, and blood tests for seniors, catches what your eyes cannot.

The source

Why the source of the answer matters

Pet nutrition is saturated with confident figures nobody can trace. Every number in this guide links to the study, regulation or guideline it came from — and checking them changed four of the draft’s figures before publication.

Lares Pecoris applies the same rule to veterinary questions: answers come from official product documents and verified veterinary sources, each statement arrives with the document behind it, and when the information is not in a real document it says so instead of guessing. That is a reference to think with — not a substitute for the veterinarian who examines your dog.

Questions owners ask

Frequently asked questions about dog nutrition

How do I read a dog food label?

A dog food label has four parts that matter: the front (marketing), the ingredients list, the analysis numbers (“analytical constituents” in the EU, “guaranteed analysis” in the US) and the adequacy statement. Start with the statement: in the EU look for “complete feed”, in the US for “complete and balanced” in the AAFCO statement, for your dog’s life stage. Then compare foods on a dry-matter basis: nutrient % ÷ (100 − moisture %) × 100.

How much should I feed my dog?

Use the feeding guide on the bag as a starting point, weigh the food on a kitchen scale, and adjust by body condition. In a University of Guelph study, owners measuring dry food by volume were off by between about 48% too little and 152% too much. Aim for a body condition score of 4 to 5 on the WSAVA 9-point scale, and keep treats under 10% of daily calories.

Is wet food or dry food better for dogs?

Neither is better in itself. Any format can feed a dog well if it is labelled complete for the dog’s life stage and fed in the right amount. Dry food is about 10% water, cheaper per calorie and easy to portion; wet food is 75–80% water, very palatable and adds fluid intake. Many households mix both, counting the calories from each.

Is raw food safe for dogs?

Raw diets carry a documented risk of bacteria such as Salmonella and Listeria, which dogs can shed without looking ill, putting the household at risk; the US FDA advises against feeding raw. Home-made raw diets are also frequently unbalanced, especially in calcium and phosphorus. If an owner chooses raw anyway, a commercial product labelled complete, handled with raw-meat hygiene, reduces but does not remove the risk.

Is grain-free dog food bad?

Not automatically, but it is not a health upgrade either. Dogs evolved to digest starch well, and the most common food allergens in dogs are beef, dairy, chicken and wheat rather than grains as a group. The FDA investigated reports of dilated cardiomyopathy in dogs eating grain-free, pea- and lentil-rich diets; its last update (December 2022) found no proven causal link, and the question remains open.

When should a puppy switch to adult food?

Commonly around 9 to 12 months for small breeds, 12 to 18 months for large breeds and up to 24 months for giant breeds, as the dog approaches adult size. Until then, feed a food labelled for growth or all life stages; large-breed puppies need a food whose statement covers large-size growth, and no added calcium.

How do I switch my dog to a new food?

Gradually over about a week: 25% new food on days 1–2, 50% on days 3–4, 75% on days 5–6 and 100% on day 7. Sensitive dogs can take 10 to 14 days. Diarrhoea lasting more than two days, blood, repeated vomiting or a dog that stops eating is a reason to call the vet.

Which human foods are dangerous for dogs?

Grapes and raisins, onions, garlic, leeks and chives, chocolate and cocoa, xylitol (also labelled birch sugar or E967), macadamia nuts, alcohol, caffeine, raw yeast dough and cooked bones. If a dog eats any of these, contact a veterinarian straight away rather than waiting for symptoms.

The takeaway

In short

Find the word “complete” for your dog’s life stage. Compare on dry matter. Weigh the food, keep treats under 10%, and aim for a body condition of 4 to 5 out of 9. Read the back of the bag, feed the right amount, and watch your dog — that is most of what good nutrition asks of you.

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