1. What is MER?

MER (Maintenance Energy Requirement) is the number of calories a dog needs daily to maintain its current weight. The Purina Institute equation provides a scientifically validated method for calculating this based on metabolic body size and activity level.

2. How Does the Calculator Work?

The calculator uses the Purina MER equation:

Where:

• \( weight_{kg} \) — Dog's weight in kilograms
• \( factor \) — Activity and life stage multiplier

Explanation: The equation accounts for the non-linear relationship between body size and metabolic rate (using the 0.75 exponent) and adjusts for different activity levels and physiological states.

3. Importance of MER Calculation

Details: Accurate MER estimation is crucial for maintaining optimal body condition, preventing obesity, and ensuring adequate nutrition for working or performance dogs.

4. Using the Calculator

Tips: Enter weight in kilograms and select the appropriate activity/life stage factor. For accurate results, weigh your dog regularly and adjust food intake based on body condition score.

5. Frequently Asked Questions (FAQ)

Q1: Why use metabolic body weight (kg^0.75)?
A: Metabolic rate scales with body surface area rather than direct weight. The 0.75 exponent accounts for this relationship.

Q2: How often should I recalculate MER?
A: Recalculate whenever your dog's weight changes by 10% or more, or if their activity level significantly changes.

Q3: What if my dog is overweight?
A: Use the weight loss factor (1.2) and calculate based on ideal weight, not current weight. Monitor progress and adjust as needed.

Q4: Are there breed-specific variations?
A: Some breeds may have slightly different metabolic rates. Monitor body condition and adjust food intake accordingly.

Q5: How should I use this for puppies?
A: Puppies have higher energy needs. Consult your veterinarian for appropriate feeding guidelines during growth.