1. What is MER and RER?

RER (Resting Energy Requirement) is the calories needed for basic bodily functions at rest. MER (Maintenance Energy Requirement) is the total daily calories needed including activity, based on Purina's recommendations.

2. How Does the Calculator Work?

The calculator uses these equations:

Where factor depends on:

• Life stage (adult, senior, puppy, etc.)
• Activity level (low, normal, high)

3. Importance of Calorie Calculation

Details: Proper calorie intake helps maintain ideal weight, supports health, and prevents obesity-related diseases in dogs.

4. Using the Calculator

Tips: Enter weight in kg, select life stage and activity level. For puppies, use the puppy setting until 12 months (or longer for large breeds).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculator?
A: It provides estimates based on Purina's guidelines. Individual needs may vary by ±20% depending on metabolism and environment.

Q2: What if my dog is overweight?
A: Use the weight loss setting (1.0x RER) or calculate for ideal weight, not current weight.

Q3: How often should I recalculate?
A: Recalculate after significant weight changes, life stage transitions, or activity level changes.

Q4: What about working dogs?
A: For highly active working dogs, use the active setting and consider higher factors (up to 5x RER).

Q5: Should I adjust for neutered dogs?
A: Neutered dogs may need 20-30% fewer calories than intact dogs of same weight.