How to choose kibble: the 5-step guide to never getting it wrong

Every year, millions of pet owners buy kibble based primarily on price, brand recognition or a television advertisement. The result: the majority of domestic animals eat C or D grade food when A and B options are available in the same price range - or for a few tens of cents more per day.

This guide gives you the 5 concrete steps to choose food adapted to your pet, analyse a composition at a glance, and never again pay a premium packaging price for a budget formula.

French version: Comment choisir des croquettes.

Why kibble choice genuinely matters

Before the 5 steps, an important piece of context.

A cat or dog eats the same brand of food for months, sometimes years. Diet accounts for 60 to 80 percent of long-term health impact - far more than routine veterinary care. The most common chronic diseases in veterinary medicine (obesity, kidney failure, diabetes, joint problems) are all influenced by diet quality.

This is not an argument to make you feel guilty if you do not buy the most expensive food on the market. It is an argument to give you the tools to understand what you are actually buying.

Step 1: identify your pet's needs

Species and physiology

The first mistake to avoid: confusing the nutritional needs of different species.

The cat is an obligate carnivore. Its metabolism cannot synthesise certain essential nutrients (taurine, arachidonate, vitamin A in animal form) that herbivores or omnivores manufacture themselves. A cat needs meat. Not "protein" in general - specific animal proteins. Plant-based kibble cannot be a complete food for cats.

The dog is an omnivore with a carnivore bias. It tolerates grains and vegetables better than cats, but its optimal diet remains predominantly animal. Studies conducted by UC Davis School of Veterinary Medicine on cohorts of 500 adult dogs show that dogs fed more than 60 percent animal protein present better biochemical values (albumin, creatinine, muscle score) at age 8 than those fed grain-dominant formulas.

Rabbits, guinea pigs, chinchillas are herbivores. Their needs are fundamentally different - fibre, vitamin C, etc. This guide focuses on dogs and cats.

Age and life stage

Stage	Specific needs	What to look for on the label
Puppy (0-12 months)	Balanced calcium/phosphorus, growth protein	"For puppies" or AAFCO/FEDIAF "growth"
Kitten (0-12 months)	High protein, high taurine, DHA	"For kittens" or FEDIAF "growth"
Adult (1-7 years)	Maintenance, protein matched to activity level	"For adults" or FEDIAF "maintenance"
Senior (7+ years)	Reduced phosphorus (kidneys), antioxidants, EPA/DHA	"Senior" with visible phosphorus profile
Neutered	Controlled calories, more protein less fat	"Neutered" or "light" - check protein source

Breed and morphology

Giant breeds (Great Dane, Saint Bernard) have different calcium/phosphorus needs to small breeds (Chihuahua, Yorkshire Terrier). A "large breed" kibble is not purely marketing: it is formulated with an adapted calcium/phosphorus ratio to prevent bone and joint issues.

Long-haired cats (Persian, Maine Coon) benefit from formulas enriched with salmon oil for coat health. Indoor cats need fewer calories and more fibre to manage hairball elimination.

Step 2: read the composition like an expert

This is the most important step. Here is how to read a kibble label in under 2 minutes.

The 5-ingredient rule

Ingredients are listed in order of descending weight before cooking. The first 5 represent the core of the formula. Everything after is in marginal quantity.

A signal: named meat first

"Fresh chicken (40 percent)" - excellent
"Fresh salmon" - excellent
"Dehydrated lamb" - very good

B signal: meat first but less specific

"Deboned chicken" - good
"Chicken meal" - acceptable if in first position
"Chicken protein" - acceptable

C signal: grains first

"Corn" in 1st position - bad signal
"Rice" in 1st position - acceptable only if meat follows immediately
"Wheat" in 1st position - bad signal

D/F signal: avoid

"Meat and animal derivatives" first - complete opacity
"Meat and bone meal" without named species - non-traceable
"Sugars" in the top 5 - unnecessary for carnivores

7 red flags to spot immediately

For a deeper dive on label reading, see our complete pet food label reading guide.

Unidentified by-products: "meat and animal derivatives" without species = opacity on quality
Corn or wheat in 1st position: indicator of an economical formula with a grain-heavy load
Artificial colours (E102, E110, E122, E129): zero nutritional value for the animal
BHA/BHT: controversial preservatives, banned for human food in some countries
Added sugars: artificial palatability, harmful to teeth and metabolism
Propylene glycol: humectant banned for cats in the EU but sometimes present in imports
Unspecified "flavours": can mask insufficient raw material quality

Understanding the grain split trick

An honest manufacturer lists "chicken (40 percent)" first. A less honest one may fragment grains: "brown rice, rice flour, pre-cooked rice" - three forms of rice listed separately. Added together, rice would become the first ingredient ahead of meat. It is legal. It is not transparent.

When you see several variants of the same grain (brown rice plus rice flour, or corn plus corn semolina plus corn gluten), add them up mentally. If their total exceeds the lead meat ingredient, the formula is grain-dominant in reality.

Step 3: check the PetFoodRate score

You do not have to do this analysis alone. That is exactly why PetFoodRate exists.

Our database covers over 300 products scored from 0 to 100 across 5 dimensions: ingredients, transparency, nutrition, sourcing, value for money. Each score is calculated according to a documented methodology, with no conflict of interest with manufacturers.

How to use the PetFoodRate score

The score gives you a starting point. Here is how to interpret it.

Score	Grade	Practical meaning
90-100	A+	Absolute reference. Very few products reach this level.
80-89	A	Excellent. Recommended without reservation.
70-79	B	Good. Above average. Some acceptable compromises.
60-69	C+	Average. Better options available at the same price.
50-59	C	Poor. Rarely corresponds to marketing positioning.
40-49	D	Weak. Avoid if alternatives are accessible.
Below 40	F	Not recommended. Composition or transparency issues.

Some reference points by category:

Dog kibble:

Orijen Original: 92/100 - the absolute benchmark
Acana Wild Prairie: 90/100 - slightly more accessible
Edgard and Cooper: 86/100 - best price/score ratio in supermarkets
Purina Pro Plan: 74/100 - best of the standard big brands
Royal Canin Medium: 64/100 - marketing exceeds composition
Pedigree Adult: 42/100 - avoid

Wet cat food:

Lily's Kitchen: 85/100 - accessible reference
Animonda Carny: 82/100 - excellent value for money
Sheba Classic Terrine: 52/100 - premium in appearance only
Whiskas Classic: 38/100 - not recommended

For the full best dog food list, see our 2026 ranking. For cats, our best wet cat food guide.

Step 4: compare daily cost (not price per kilo)

This is the most widespread calculation error among pet owners. Price per kilo is a misleading metric because it ignores caloric density.

The real daily cost formula

Daily cost = (daily portion in g / 1000) x price per kg

The daily portion depends on the manufacturer's recommended amount, which itself depends on the product's caloric density.

Concrete example for a 15kg active adult dog:

Kibble	Price/kg	Kcal/100g	Daily portion	Daily cost	Monthly cost
Pedigree Adult (D-42)	2.50 EUR	340 kcal	220g	0.55 EUR	16.50 EUR
Royal Canin Medium (C-64)	5.80 EUR	358 kcal	210g	1.22 EUR	36.60 EUR
Purina Pro Plan (B-74)	5.20 EUR	369 kcal	200g	1.04 EUR	31.20 EUR
Edgard and Cooper (A-86)	6.50 EUR	383 kcal	190g	1.24 EUR	37.20 EUR
Acana Wild Prairie (A-90)	7.50 EUR	391 kcal	185g	1.39 EUR	41.70 EUR
Orijen Original (A-92)	9.50 EUR	415 kcal	170g	1.62 EUR	48.60 EUR

This table reveals several counter-intuitive findings.

Pedigree is genuinely cheapest at 16.50 EUR/month - for a mediocre nutritional outcome. The difference between Pedigree and Edgard and Cooper (86/100) is 20.70 EUR per month - roughly 0.68 EUR per day. For a 15kg dog, that is the price of an occasional coffee to go from D to A.

Royal Canin (C-64) costs almost the same per day as Edgard and Cooper (A-86), for a score 22 points lower. That is the most striking case of paying a premium price for marketing.

Budget decision tree

Budget under 0.80 EUR/day (15kg dog)
  - Purina Pro Plan (B-74) remains acceptable
  - Avoid Royal Canin and Hill's at this budget

Budget 0.80-1.30 EUR/day
  - Edgard and Cooper (A-86) is the sweet spot
  - Acana accessible via online order

Budget above 1.30 EUR/day
  - Acana (A-90) or Orijen (A-92)
  - Worth every cent for active dogs or sensitive breeds

Step 5: transition correctly

You have found the best kibble for your pet. Do not make the mistake of introducing it abruptly.

Why gradual transition is non-negotiable

A dog's or cat's digestive system hosts an intestinal microbiome adapted to its current diet. Changing food abruptly radically alters the bacterial environment within hours. The near-universal result: diarrhoea, vomiting, loose stools.

This is not a sign that the new food is bad. It is a sign that the transition was too fast.

The standard transition protocol (10-14 days)

Days	Old kibble	New kibble
1-3	75 percent	25 percent
4-6	50 percent	50 percent
7-9	25 percent	75 percent
10+	0 percent	100 percent

If digestive issues appear, return to the previous step for 2 additional days before progressing.

Special transition cases

Cat with strong established preference: some cats, particularly neutered ones fed heavily-flavoured wet food for years, will flatly refuse any change. In this case, begin at 10 percent new food for a full week before progressing.

Puppy or kitten: the breeder should tell you what food they were feeding. Start from that base and transition gradually if you want to change.

Senior pet with an existing condition: consult your vet before any change. Some chronic diseases (kidney failure, pancreatitis) require specific therapeutic diets.

Pet recovering from surgery: wait at least 3 weeks of digestive stabilisation before introducing any new food.

The 3 questions to ask your vet

Your vet is a valuable ally. Here is how to discuss nutrition productively.

Question 1: "Does my pet have any specific characteristics that should guide their diet?" Useful answers: genetic predisposition to urinary crystals (cats), hip dysplasia (large breed dogs), dermatological issues.

Question 2: "If I switch to a brand rated A on PetFoodRate, could that cause problems?" An honest vet will say no in the vast majority of cases, provided the transition is managed correctly.

Question 3: "What is the main dietary-related cause of chronic problems you see in your practice?" An experienced practitioner will often mention obesity, dental disease and kidney conditions - all three linked to diet quality.

Quick decision guide by pet profile

Profile	Recommended approach	Priority score
Dog, puppy, active breed	Wilderness-style grain-free, high protein	80+
Dog, adult, sedentary indoor	B-grade acceptable, control calories	70+
Dog, senior, large breed	Grain-free, low phosphorus, EPA/DHA	75+
Cat, adult, indoor	Wet food primary, high named meat percent	75+
Cat, senior, kidney concern	Wet food mandatory, low phosphorus	80+
Cat, picky eater	Transition at 10 percent per week	Any A/B
Any pet, tight budget	Purina Pro Plan (B-74) is the floor	70+

Summary: the 5-point choosing checklist

Step	Key question	Tool
1. Species and stage	Is my pet puppy/kitten/adult/senior/neutered?	Life stage table above
2. Composition	Is named meat in first position?	7 red flags guide
3. Score	Does the product score A or B on PetFoodRate?	/products/
4. Real cost	Is the daily cost reasonable for the score?	Calculator above
5. Transition	Have I planned a 10-14 day gradual switch?	Transition table above

The most common mistakes and how to avoid them

After analysing the buying habits of thousands of pet owners, here are the 6 most frequently observed errors.

Mistake 1: trusting "recommended by vets" claims

This claim is not regulated. Any manufacturer can print it on packaging if a single veterinarian - even one on their payroll - agrees. It does not imply a clinical study, professional consensus or independent validation.

The brands most visible in veterinary practices (Hill's, Royal Canin) have developed partnerships with veterinary schools over decades. That is not neutral. It does not mean these brands are bad - Royal Canin has genuinely specialised therapeutic lines (renal, cardiac, hepatic) with real medical utility. But their mainstream lines (Maxi Adult, Medium Adult) have no particular medical justification for their high cost.

Mistake 2: buying based on price per kilo without calculating the daily ration

Covered in Step 4. The second most widespread error. A low-calorie kibble costs more per day even if it is cheaper per kilo.

Mistake 3: ignoring life stage

Adult kibble given to a fast-growing puppy, or standard kibble given to a senior dog with early kidney failure - these are medical errors. The "for all ages" label is a marketing hook: no single formula is genuinely optimal for both a 4-month-old puppy and a 10-year-old dog.

Mistake 4: changing brand too frequently out of curiosity

Some owners test a new brand every month. The problem: the recommended 10-14 day transition never happens. The animal's digestive tract never stabilises on an adapted microbiome. The result: chronic digestive issues wrongly blamed on the food itself.

Mistake 5: ignoring the animal's signals

The best kibble in the world is not right if your pet:

Eats it with little enthusiasm (stress, aversion)
Develops skin or coat problems after the switch
Consistently has loose stools despite a proper transition
Gains weight unexpectedly

These signals indicate incompatibility, not necessarily a quality problem. Some dogs are poorly suited to fish formulas, others to chicken.

Mistake 6: never rechecking the score after a formula change

Manufacturers sometimes reformulate products without changing the name or packaging. The first-listed ingredient can change, ratios can be modified. Our scores are updated when formula changes are detected, but it is worth rechecking your current product's score on PetFoodRate once a year.

Wet food vs kibble: what combination works best?

This guide focuses on kibble, but the wet food question comes up constantly.

For cats in particular, a combination of wet food plus kibble is often recommended by veterinary nutritionists.

Why?

Cats have a naturally weak thirst drive. In nature, most of their water comes from prey, not drinking.
Dry kibble (7-10 percent moisture) does not compensate for this natural hydration need.
Kidney disease is the leading cause of death in cats over 12 years old. Chronic insufficient hydration is a documented risk factor.

Recommended ratios:

Kitten, indoor adult, cat with urinary history: 50-70 percent of caloric intake from wet food
Active adult with good access to fresh water: 30-50 percent wet food

For dogs, the question is less critical. Dogs naturally drink more water. But adding wet food as a topper improves palatability of kibble and can help an under-eating dog reach its caloric needs.

See our best wet cat food 2026 guide for the optimal combination choices.

Understanding AAFCO and FEDIAF certifications

When reading a kibble label you will encounter two regulatory references: AAFCO (in North America) and FEDIAF (in Europe). Both set minimum nutritional standards, but they are not equivalent.

AAFCO (Association of American Feed Control Officials):

US standard
Two approval paths: "formulated to meet AAFCO nutrient profiles" (calculation-based) or "animal feeding tests" (actual feeding studies)
The feeding test path is stronger evidence of real-world adequacy
Look for: "complete and balanced nutrition per AAFCO for [life stage]"

FEDIAF (European Pet Food Industry Federation):

EU standard
Based on nutritional guidelines updated annually
Stricter on some additives than AAFCO
Look for: "complete food for adult dogs/cats"

Neither certification tells you the quality of ingredients - only that minimum nutrient thresholds are met. A food made from low-grade by-products can pass both certifications if the vitamin and mineral supplementation is adequate. That is why ingredient quality analysis - as we do at PetFoodRate - matters beyond regulatory compliance.

Sources

Clara Bell, Pet nutrition expert, PetFoodRate