How Much Should I Feed My Dog? A Complete Guide to Portion Sizes

Why Bag Guidelines Are Inaccurate

Every bag of dog food includes a feeding guide chart, but these recommendations are deliberately set high. Pet food companies are incentivized to encourage more consumption. Studies show that feeding 10–25% less than bag recommendations while maintaining healthy body weight is common for many dogs.

The correct approach is to calculate your dog's individual Daily Energy Requirement (DER) and then determine how many cups of your specific food provide that calorie amount.

Step-by-Step Portion Calculation

Step 1: Calculate RER (Resting Energy Requirement) RER = 70 × (weight in kg)^0.75

Example: 15 kg (33 lb) dog → RER = 70 × (15)^0.75 = 70 × 7.62 = 533 kcal/day

Step 2: Apply Life Stage Multiplier

• Neutered adult: × 1.6 = 853 kcal/day
• Active adult: × 2.0 = 1,066 kcal/day
• Weight loss: × 1.0 = 533 kcal/day

Step 3: Check Calorie Density of Your Food Find kcal/cup on the bag or manufacturer website. Example: 350 kcal/cup

Step 4: Calculate Daily Portions 853 ÷ 350 = 2.4 cups per day

Adjusting Based on Body Condition

Calculations are a starting point. Every 2–4 weeks, assess your dog's Body Condition Score (BCS):

• BCS 1–3: Underweight — increase by 10–20%
• BCS 4–5: Ideal — maintain
• BCS 6–7: Overweight — reduce by 10–20%
• BCS 8–9: Obese — reduce significantly, consult your vet

Factors That Increase Calorie Needs

• High activity level or working dog
• Cold weather (outdoor dogs in winter)
• Pregnancy or nursing
• Post-surgery recovery
• Growing puppy

Factors That Decrease Calorie Needs

• Spay/neuter (reduces needs by 20–30%)
• Reduced activity (senior, injured, or sedentary dog)
• Hot weather
• Indoor lifestyle

Use our Fuel Tracker to get a precise DER calculation tailored to your dog's specific profile.