Shun NagaiThis article provides a practical, development-oriented explanation of how to set feeding amounts and how to present them on labels for complete and balanced foods for dogs and cats in the Japanese market (dry food, wet food, freeze-dried, and air-dried), based on AAFCO (Association of American Feed Control Officials) standards. The target readers are product development leaders, and the goal is to offer specialized knowledge that helps with product formulation and label creation.
Because AAFCO standards are also adopted by the Japan Pet Food Fair Trade Council, this guide covers: how to calculate energy requirements and feeding amounts according to life stage (growth, adult maintenance, senior, pregnancy/lactation, etc.) and condition (e.g., weight-prone pets); how energy density differs by product format; calorie calculation using the Modified Atwater Factors; and practical points for Japan’s label requirements with concrete examples.
How to think about energy requirements
To set feeding amounts for pet food, you first estimate the animal’s energy requirement (needed calories). The energy needed at rest is called RER (Resting Energy Requirement). When RER is adjusted using a factor for life stage and activity level, it becomes MER (Maintenance Energy Requirement) or DER (Daily Energy Requirement).
In Japan, product design is often based on AAFCO concepts, but you do not need to print terms like “MER” or “DER” on the label. In practice, you typically calculate a daily feeding amount table (g/day) by starting from RER and multiplying by a factor. Therefore, it is acceptable to treat MER and DER as essentially synonymous in the text; to avoid confusion, you can add a note such as “MER (also referred to as DER).”
MER (Maintenance Energy Requirement) and DER (Daily Energy Requirement) are often used interchangeably, including in AAFCO-related contexts and veterinary nutrition literature.
Below are the RER formula and typical life-stage multipliers (MER factors).
RER (Resting Energy Requirement)
RER is the minimum energy needed for basic life support functions such as temperature regulation, breathing, and heart activity.
Formula
RER = 70 × (Body weight in kg)^0.75
A simplified formula, “RER = 30 × body weight (kg) + 70,” is also used, but for animals under 2 kg or over 45 kg it can produce larger errors. For these ranges, the exponential formula is recommended.
MER (Maintenance Energy Requirement)
MER represents the energy needed for real daily life. It is calculated by multiplying RER by a factor that reflects life stage and condition.
Formula
MER = RER × Life-stage factor
Overview of MER factors
Typical MER factors (dogs)
| Life stage / condition | MER factor (× RER) |
|---|---|
| Adult (neutered/spayed) | 1.6 |
| Adult (intact) | 1.8 |
| Low activity (weight-prone, indoor lifestyle) | 1.2-1.4 |
| Active/working dogs | 2.0-5.0+ |
| Puppy (to ~4 months) | ~3.0 |
| Puppy (4–9 months) | 2.0-2.5 |
| Puppy (9–12 months) | 1.8-2.0 |
| (Large breeds may remain in growth phase for 18–24 months) | ~2.0 |
| Dam (late pregnancy) | ~3.0 |
| Dam (lactation, varies with litter size) | 3.0-6.0+ |
| Weight loss (obese dog on reduction plan) | 0.8-1.0 |
| Early senior stage | 1.1-1.4 |
Typical MER factors (cats)
| Life stage / condition | MER factor (× RER) |
|---|---|
| Adult (neutered/spayed) | 1.2-1.4 |
| Adult (intact) | 1.4-1.6 |
| Low activity / weight management | 0.8-1.0 |
| Kitten (to ~4 months) | 3.0 |
| Kitten (4 months to ~1 year) | 2.5 |
| Queen (late pregnancy) | 1.6-2.0 |
| Queen (lactation, varies with litter size) | 2.0-6.0 |
| Early senior (7–11 years) | 1.1-1.4 |
| Very old (12+ years) | 1.1-1.6 |
RER reflects basal metabolism (minimum energy), while MER reflects energy needed for daily living. Activity, growth, pregnancy/lactation, and disease can all affect MER. Depending on the individual, differences of around ±50% can occur, so feeding amounts should be adjusted continuously.
Feeding amount models by life stage and body weight
Once MER (or DER) is estimated, the next step is to calculate the food weight (grams) needed to meet that energy. The feeding amount (g/day) is simply:
Daily required calories ÷ energy density of the food
Most pet foods display metabolizable energy (ME) as “kcal/100 g” or “kcal/kg.” For example, if a food is 350 kcal/100 g and MER is 700 kcal/day:
Feeding amount = 700 ÷ 350 × 100 = 200 g/day
Feeding amount formula (g/day)
Feeding amount (g/day) = (Pet’s MER in kcal/day) ÷ (Food ME in kcal/100 g) × 100
In reality, MER requires individual adjustment as described above, so the calculated value should be treated as a guideline. Pet food packages usually include recommended feeding tables by body weight and life stage.
As a development lead, you design the feeding table based on your product’s ME and the average energy needs of the target population. Below are model examples for dogs and cats using dry food (values are approximations).
Adult dog food model (ME ≈ 350 kcal/100 g)
5 kg adult dog (neutered/spayed)
10 kg adult dog (neutered/spayed)
In practice, values are rounded for readability, e.g., “5 kg: 110 g, 10 kg: 180 g.” For very low-activity dogs, 10–20% less may be appropriate; for very active dogs, more may be needed. This should be clarified in label notes.
Puppy food model (ME ≈ 400 kcal/100 g)
2.5 kg puppy (to ~4 months)
5 kg puppy (~6 months)
For puppy diets, feeding guides are commonly presented as a matrix table by age (months) and expected adult weight (e.g., age on the vertical axis, expected adult body weight on the horizontal axis). This format helps owners adjust amounts step-by-step as growth progresses.
Adult cat food model (ME ≈ 350 kcal/100 g)
4 kg adult cat (neutered/spayed)
4 kg adult cat (weight-prone / low activity)
For a 4 kg neutered/spayed adult cat, MER is roughly RER × 1.2–1.4 ≈ 238–278 kcal/day, which corresponds to about 68–80 g/day. Many commercial diets list values like “4 kg adult cat: 75 g/day.”
If the cat is weight-prone, you might start 10–20% lower (around 60 g) and adjust. If the cat is very active, you might increase to around 85 g. The label should clearly state: “Adjust according to individual differences and activity level.”
Kitten food model (ME ≈ 400 kcal/100 g)
2.0 kg kitten (4 months to ~1 year)
A 2 kg kitten (4 months to ~1 year) may require about 295 kcal/day, corresponding to 74 g/day—roughly similar to the daily amount for a 4 kg adult cat. The key point is that per kg body weight, kittens eat nearly twice as much energy. Because kittens gain weight quickly, requirements can change significantly within 1–2 months.
In feeding guides, it can be helpful to add an explanation such as: “Kittens under 4 months may require around 3× the energy of adults; until 1 year, around 2.5×,” and also include guidance on feeding frequency (e.g., 3–4 meals/day).
Feeding models are built primarily around life stage (growth level) and body weight. As a developer, you calculate grams based on your product’s energy content and the average energy needs of your target pets.
It is important to set values that avoid both overfeeding and underfeeding while maintaining a safety margin. In actual label text, you should always add a disclaimer such as:
“The above amounts are guidelines. Adjust according to age, activity level, and individual differences.”
Feeding tables are a guide for owners, but the desired outcome is to encourage them to adjust amounts based on the pet’s body condition and health.
Using a feeding amount calculator tool
How feeding amounts differ by energy density across food formats
Because different product formats vary greatly in moisture and nutrient concentration, the amount (weight/volume) needed to deliver the same calories can differ substantially. Development leaders must understand each product’s energy density and set feeding amounts accordingly.
Below are typical energy density ranges and practical characteristics for dry, wet, freeze-dried, and air-dried foods.
Dry food (kibble)
Dry foods typically have around 10% moisture, meaning nutrients are concentrated. Energy density is generally around 3.5–4.5 kcal/g (3,500–4,500 kcal/kg). Higher-fat products may approach 5 kcal/g. For example, some premium high-protein cat foods list ME around 4,160 kcal/kg (= 4.16 kcal/g).
Because calories per gram are high, the daily feeding amount in grams is relatively small. However, owners may under-provide water intake, so feeding guides often include: “Always provide fresh water.”
Dry foods are stable and easy to measure and manage, but because they deliver “high calories in a small amount,” feeding tables should be designed to minimize the risk of overfeeding.
Wet food (cans/pouches)
Wet foods usually contain 75–80% moisture. Energy density is typically around 0.8–1.2 kcal/g (800–1,200 kcal/kg), roughly one-third to one-quarter that of dry food per gram.
As a result, feeding guides show larger quantities and often use units like “cans per day” or “pouches per day.” For example, where a 5 kg cat might need about 80 g/day of dry food, it could require around 400 g/day of wet food, depending on the product.
Wet foods provide satiety due to volume and can be useful for weight management when used to add bulk. They are often highly palatable and helpful for senior pets or poor appetite cases. On the other hand, they require refrigeration after opening and prompt use, and they may adhere to teeth more easily.
From a feeding guide design perspective, consider including advice such as: “Divide into 2–3 meals per day,” and “Remove leftovers.”
Freeze-dried food
Freeze-dried foods are made by rapidly freezing raw materials (e.g., raw meat) and drying under vacuum. Moisture is extremely low (often below 5%), so nutrient density is very high. Energy density commonly reaches 4.0–5.0 kcal/g (4,000–5,000 kcal/kg). Some freeze-dried raw diets list ME around 4,630 kcal/kg.
Because these foods are so energy-dense, the feeding amount in grams appears very small. First-time owners may worry that “it looks like too little,” so it helps to include wording such as: “This product is highly nutrient-dense, so a small amount is sufficient,” and to clearly state rehydration instructions if recommended.
Many freeze-dried products also recommend rehydrating with lukewarm water. Rehydration increases weight and may improve palatability, but calories do not change—so the correct practice is to weigh the dry amount first and then add water.
Air-dried food
Air-dried foods are dehydrated slowly (often with low-temperature airflow) and typically have around 10% moisture. Energy density tends to be very high, around 4.5–5.5 kcal/g (4,500–5,500 kcal/kg). For example, a New Zealand air-dried dog food may list ME around 4,900 kcal/kg (beef recipe).
Like freeze-dried foods, air-dried foods deliver high energy in a small amount, so the daily grams can be a very small number. Some products provide guidance using scoops. Because many air-dried recipes are high in animal protein and fat and highly palatable, overfeeding is a common risk. It can be appropriate to include a warning such as: “Because this product is highly nutrient-dense, do not exceed the recommended feeding amount.”
When formulating an air-dried product as “complete and balanced,” be mindful of vitamin/mineral balance so that the diet meets AAFCO minimums without creating excessive levels.
Setting feeding amounts in line with energy density
Because daily grams vary greatly by format, you must set feeding guides in a way that matches the product’s energy density. This becomes especially important when you offer multiple formats under the same series (e.g., a dry and wet version of a similar recipe). Label wording should carefully prevent consumer confusion, such as:
- “This wet product contains more moisture, so the daily amount is higher than our dry product.”
- “Freeze-dried products are highly nutrient-dense, so please follow the feeding guide carefully.”
It is also helpful to include guidance for mixed feeding. For example:
“If feeding dry and wet together, adjust the amounts based on calories (e.g., if feeding half of each, feed X g of dry and Y g of wet).”
The goal is clear, unambiguous labeling that helps owners manage feeding amounts appropriately.
How to estimate metabolizable energy (ME)
To estimate metabolizable energy (ME) for pet foods, AAFCO provides a model calculation using the Modified Atwater Factors.
This method, proposed in the 1980s based on measured data, assigns 3.5 kcal/g to protein and carbohydrates, and 8.5 kcal/g to fat, then multiplies these factors by the guaranteed analysis values to estimate energy.
An example formula for ME (kcal/kg) is shown below. (%) indicates the weight percent in the food. NFE represents carbohydrates and is calculated by difference (subtracting moisture, ash, and crude fiber).
ME (kcal/kg) = [3.5 × (% crude protein) + 8.5 × (% crude fat) + 3.5 × (% carbohydrate [NFE])] × 10
For example, for a food with 24% crude protein, 15% crude fat, and 45% carbohydrate (NFE), ME is approximately 3,690 kcal/kg.
The Modified Atwater equation is officially accepted by AAFCO, and if direct feeding trials or measured energy tests are not available, it can be used for label calorie declarations. It is simple and practical, but note that it can under- or over-estimate ME depending on digestibility.
Feeding guide label examples for growth and senior stages
As representative life-stage examples, this section introduces model label presentations for feeding guides in growth (puppies/kittens) and senior (senior dogs/senior cats). These stages differ greatly in nutrient requirements from adult maintenance, so labels require special care and explanation.
Feeding guide labeling for puppy/kitten foods
Example puppy feeding table
| Age / Expected adult weight | 5kg | 10kg | 20kg | 30kg以上 |
|---|---|---|---|---|
| 2-3 months | 100g/day | 160g/day | 250g/day | 350g/day |
| 4-6 months | 90g/day | 150g/day | 240g/day | 330g/day |
| 7-12 months | 80g/day | 130g/day | 220g/day | 310g/day |
Feeding frequency and method
Because puppies cannot digest large meals at once, include guidance such as:
“Divide the daily amount into 3–4 meals,” and “Start transitioning to solid food around 6 weeks as teeth develop.”
For kittens: “Up to ~4 months: 4 meals/day; up to ~1 year: about 3 meals/day.”
Growth-stage specific cautions
Include practical notes such as:
“Because puppies and kittens grow quickly, measure body weight regularly and review the feeding amount.”
“Overfeeding can increase the risk of obesity later in life.”
“Puppy food is nutrient-dense; adult food may not meet the needs of growing animals.”
For large-breed puppies, overnutrition can raise the risk of skeletal problems. Because AAFCO sets specific constraints such as calcium limits for large-breed puppy diets, you may also include a note encouraging appropriate growth management.
Example wording (model)
Feeding guide (per day)
3 months: 2 kg → 120 g; 4 kg → 200 g; 6 kg → 270 g
6 months: 4 kg → 150 g; 8 kg → 240 g; 12 kg → 300 g
9 months: 6 kg → 140 g; 12 kg → 230 g; 18 kg → 290 g
*These amounts are based on an expected adult body weight of approximately 24 kg.
*Large-breed dogs have a longer growth period; continue feeding puppy food after 12 months as appropriate.
How to feed
Divide the daily amount into 3–4 meals.
Up to around 3 months of age, smaller and more frequent meals are ideal.
Transition gradually from softened food to dry kibble.
Caution
Individual needs vary. These amounts are guidelines. Weigh your puppy weekly and adjust based on body condition. Overfeeding can increase obesity risk. Always provide fresh water.
Depending on package space, you may simplify and direct consumers to your website, e.g., “For detailed feeding guidance, please visit our website.”
Feeding guide labeling for senior dog/cat foods
Example senior dog feeding guide
| Body weight / Body condition | standard | weight-prone | underweight |
|---|---|---|---|
| 5kg | 90g/day | 75g/day | 100g/day |
| 10kg | 150g/day | 125g/day | 170g/day |
| 20kg | 240g/day | 200g/day | 270g/day |
Practical considerations
Senior diets often have slightly lower energy density, which can make the recommended grams appear higher than adult diets (because more grams are needed to deliver the same calories). For example, a 10 kg dog might be listed as 160 g/day for an adult diet but 180 g/day for a senior diet.
Because activity level varies widely in seniors, provide ranges or multiple columns. For example:
“10 kg: 150–180 g/day (adjust based on activity level),” or separate columns for “standard” and “weight-prone.”
Feeding frequency and supportive advice
Because some seniors cannot eat large meals comfortably, include:
“Divide into at least two meals per day,” and “If digestive efficiency is reduced, smaller portions more frequently may reduce burden.”
For seniors with dental issues: “Soften with warm water if needed,” or “Combine with wet food.” For cats, you may also suggest increasing water intake (e.g., combining with soup-style wet foods), especially from a hydration management perspective.
Senior-stage cautions
Balance obesity prevention with attention to undernutrition and illness signs. Consider including:
“Energy needs may decrease by about 15–20% in senior life. Monitor body condition to avoid weight gain.”
“Excess weight increases the risk of joint disease and diabetes.”
“If appetite loss or weight loss persists, consult a veterinarian.”
“Always provide sufficient fresh water.”
Example wording (model)
Feeding guide (senior dog, per day)
5 kg: 100–115 g; 10 kg: 150–180 g; 20 kg: 240–280 g
*Assumes a relatively calm indoor senior dog.
*Feed slightly more if active, and less if weight-prone.
How to feed
Divide into at least two meals per day.
If digestion is reduced, smaller and more frequent meals may reduce burden.
Caution
In senior life, energy needs often decrease. Adjust based on body condition. Obesity increases the risk of joint disease and diabetes. If appetite loss or weight loss continues, consult a veterinarian. Always provide fresh water.
The essential point is to offer “life-stage-specific guidance” that supports owners in managing feeding appropriately, which in turn improves confidence in your product.
The practical position of “AAFCO-compliant” in Japan
Finally, this section explains how AAFCO compliance is positioned in Japan and briefly notes differences from Europe’s FEDIAF guidelines.
Japan’s regulations and the use of AAFCO standards
In Japan, the Act on Ensuring the Safety of Pet Food (enforced in 2009) sets minimum rules for labeling and ingredient standards. However, detailed nutritional standards are not independently defined by law; they are largely handled through industry self-regulation.
Specifically, the Fair Competition Code of the Japan Pet Food Fair Trade Council states that AAFCO nutrient profiles and feeding trial protocols are adopted. In practice, to label a product as “complete and balanced” in Japan, it must meet AAFCO standards.
As a result, AAFCO life-stage nutrient minimums (for growth and for adult maintenance) function as the de facto standard in Japan, and many domestic and imported products are formulated and labeled accordingly. Products labeled “complete and balanced” are required to include a statement indicating that the product meets the standard based on the Fair Trade Council’s rules.
For example, when compliance is demonstrated via analytical testing, labels may include a statement such as:
“Based on the results of analytical testing as defined by the Japan Pet Food Fair Trade Council, this product has been verified to meet the standards for a complete and balanced diet.”
In short, while Japanese law does not directly cite AAFCO, AAFCO compliance is effectively required as an industry standard and is treated as a key quality assurance signal.
Differences from FEDIAF (supplementary)
FEDIAF (the European Pet Food Industry Federation) provides nutritional guidelines for Europe, similar in role to AAFCO. Since the publication of nutritional guidelines in 2008, FEDIAF standards have been widely adopted in Europe.
Both AAFCO and FEDIAF update their standards regularly based on the latest research, and their nutrient requirement values are broadly similar. However, some details differ. For example, AAFCO has very specific naming rules for ingredients (e.g., the definitions and labeling rules for “chicken” vs “chicken meal”), while FEDIAF may allow more flexible category-style labeling in some contexts.
There are also differences in certain nutrient items, such as more explicit guidance on fiber targets in Europe, or slightly different recommended levels for some vitamins and minerals. Still, both frameworks share the same purpose: defining standards for diets that meet nutritional needs as a “complete food” when fed with water.
Japan primarily follows AAFCO as noted above, but if you plan exports to Europe, it is prudent to also consider FEDIAF guidelines. FEDIAF also addresses quality management recommendations such as HACCP adoption, which is an area AAFCO does not directly govern in the same way.
Summary: AAFCO as the de facto domestic standard
In Japan, the rules of the Japan Pet Food Fair Trade Council make AAFCO nutrient profile compliance a requirement for labeling a product as “complete and balanced.” While not a direct legal citation, it functions strongly as an industry standard—effectively, “AAFCO = the domestic standard.”
Therefore, for product development in Japan, meeting AAFCO nutrient profiles is essential. Differences from FEDIAF tend to be in the details; the core purpose is the same: defining a complete diet that meets a pet’s nutritional needs. Development leaders should monitor updates in both frameworks and reflect them appropriately in formulations and labeling.
Related article: Don’t let your pet food be ruined—rethink packaging strategy from an oxidation-control perspective