1. What is Purina's MER Equation?

The Purina MER (Maintenance Energy Requirement) equation calculates the daily calorie needs for dogs based on body weight and activity level factors. It provides an accurate estimate of the energy required to maintain optimal health and body condition.

2. How Does the Calculator Work?

The calculator uses Purina's MER equation:

Where:

• \( Weight \) — Body weight in kilograms (kg)
• \( Factor \) — Activity level and life stage factor

Common Factors:

• 1.6 — Neutered adult (typical maintenance)
• 1.8 — Intact adult
• 2.0 — Active adult or puppy 4-12 months
• 3.0 — Working dog, pregnant/lactating, or puppy 0-4 months
• 2.5 — Pregnant/lactating (alternative factor)

3. Importance of Calorie Calculation

Details: Accurate calorie calculation is crucial for maintaining optimal body condition, preventing obesity, and ensuring proper nutrition for different life stages and activity levels.

4. Using the Calculator

Tips: Enter body weight in kilograms, select the appropriate factor based on your dog's life stage and activity level. All values must be valid (weight > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between MER and DER?
A: MER (Maintenance Energy Requirement) is the energy needed to maintain current body weight, while DER (Daily Energy Requirement) includes additional factors for activity and life stage.

Q2: How often should I recalculate my dog's calorie needs?
A: Recalculate whenever your dog's weight changes by more than 10%, or if there are significant changes in activity level or life stage.

Q3: What if my dog is overweight or underweight?
A: Adjust the calculated value by ±10-20% based on whether you need weight loss or weight gain, and consult with your veterinarian.

Q4: Are there breed-specific considerations?
A: Some breeds may have different metabolic rates. Giant breeds and toy breeds may require adjustments to the standard calculation.

Q5: Should this be used for sick or recovering dogs?
A: For dogs with medical conditions or recovering from illness/surgery, consult your veterinarian for specialized nutritional guidance.