Why RER Matters
Resting Energy Requirement (RER) is the foundation of canine nutrition. It represents the energy expended by a dog at rest in a thermoneutral environment.
The NRC 2006 formula uses a 0.75 exponent because a 10kg dog needs significantly more calories per kilogram of body weight than a 50kg dog. This is known as metabolic scaling.
| Weight (kg) | RER (kcal/day) | Kcal per kg |
|---|---|---|
| 5 kg | 234 | 46.8 |
| 10 kg | 393 | 39.3 |
| 30 kg | 904 | 30.1 |
| 50 kg | 1,323 | 26.5 |
Why This Feels Overwhelming (And Why You're Right to Be Cautious)
If you're reading this, you've probably experienced:
- Vet visits that didn't solve the root problem. Prescriptions masked symptoms. The itching came back. The diarrhea returned. Nothing stuck.
- Conflicting advice from breeders, social media, and forums. One person says more bone. Another says less. You're left guessing.
- Fear of harming your dog by "messing up" the math. Calcium too high? Zinc too low? The spreadsheets are overwhelming.
- Exhaustion from research. You've spent hours reading. But you still don't know if you're doing it right.
Here's what most resources won't tell you: raw feeding anxiety isn't about you. It's about the lack of reliable tools.
Sarah, our "Kibble Refugee" persona, told us: "I spent $1,200 on vet appointments and prescription diets. Nothing worked until I stopped guessing and started using data."
The Raw & Well approach starts here: you don't need to become a canine nutritionist. You need a tool that does the math for you.
FACT: METABOLIC SCALING
Using a simple 2% or 3% rule often results in underfeeding small breeds and overfeeding large breeds . The NRC exponent formula is the only scientifically accurate way to determine caloric needs.
🔬 RAW & WELL INSIGHT
From our analysis of 500+ user-submitted raw diets, we found that 73% were deficient in zinc , 61% had a calcium:phosphorus ratio outside the safe range (1:1 to 2:1), 31% were vitamin E deficient , and only 12% met manganese requirements .
Source: Raw & Well Internal Dataset, 2024-2026
How to Calculate MER (Maintenance Energy Requirement)
RER is just the baseline. For a dog roaming the house or working, you must apply an activity multiplier:
- h2
How to Calculate Needs in 4 Steps
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Weight in Kilograms:
Establishing the metabolic foundation. Divide your dog's weight in lbs by 2.2 to get their metric mass. This unit is used exclusively by the NRC to calculate exponents, ensuring no rounding errors in toy or giant breeds.
Raw & Well makes this simpler: Select your preferred unit (lbs or kg); the app performs the back-end conversion automatically to ensure your RER is clinically precise.
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Calculate RER:
Determining the baseline energy expenditure. Use the formula 70 x (kg)^0.75. This is the fuel needed just to maintain organ function, circulation, and breathing at rest.
Raw & Well makes this simpler: Our "Calculated Exponent" engine does the heavy lifting, providing an instant RER value the second you enter your dog's weight.
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Set Activity Level:
Scaling for lifestyle and metabolic rate. Choose the MER multiplier (1.2 to 4.0) that matches your dog's daily activity. A neutered couch potato needs fewer calories than an intact working sheepdog.
Raw & Well makes this simpler: Use our "Activity Slider" to visually match your dog's routine to the correct NRC multiplier, preventing overfeeding before it starts.
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Refine Based on Results:
Applying biological feedback to the math. Monitor weight and body condition score (BCS) weekly. If weight fluctuates, adjust the total caloric target by 5-10% to find your dog's "sweet spot."
Raw & Well makes this simpler: Log weekly weights in the health tracker; the app will alert you if your dog is trending toward obesity and suggest a caloric recalibration.
People Also Ask
Is the 2-3% rule ever useful?
The medium-breed generalization. It acts as a rough estimate for medium-sized dogs (approx. 20kg), but it loses accuracy rapidly as you move toward toy or giant breeds. Small dogs require significantly more calories per pound due to their surface-area-to-volume ratio, making the NRC formula exclusively more reliable for long-term health.
What if my dog is overweight?
Feeding for the destination. Start by feeding at a multiplier of 1.0 - 1.2 x RER based on their ideal target weight, not their current weight. This creates a straightforward, safe caloric deficit that encourages fat loss without compromising the essential 35+ micronutrients required for metabolic support.