How Much Food Does My Dog Need? A Simple Guide to Daily Calories

Why Portion Size Matters More Than You Think

Overfeeding and underfeeding are two of the most common nutritional mistakes dog owners make. Too much food leads to obesity — a condition affecting an estimated 56% of dogs in North America. Too little food results in nutrient deficiencies, muscle loss, and low energy.

The good news is that calculating your dog's caloric needs is simpler than it sounds. With a basic formula and a few adjustments, you can dial in the right amount with confidence.

Step 1: Calculate Resting Energy Requirement (RER)

The Resting Energy Requirement is the number of calories your dog needs at complete rest — just to keep their body functioning (breathing, circulation, digestion).

RER Formula:

RER = 70 x (body weight in kg) ^ 0.75

Quick RER Reference Table

Body Weight (kg)	RER (kcal/day)
5 kg	234
10 kg	394
15 kg	534
20 kg	662
25 kg	783
30 kg	897
40 kg	1,113
50 kg	1,316

If the math feels daunting, your veterinarian or an online pet calorie calculator can do it for you.

Step 2: Apply the Maintenance Energy Requirement (MER)

The Maintenance Energy Requirement adjusts the RER based on your dog's life stage, activity level, and health status.

MER = RER x Activity Factor

Activity Factors

Life Stage / Activity Level	Multiply RER by
Neutered adult, normal activity	1.6
Intact adult, normal activity	1.8
Light activity / sedentary	1.2–1.4
Moderate activity (daily walks, play)	1.6–1.8
High activity (working dogs, agility)	2.0–3.0
Weight loss needed	1.0–1.2
Weight gain needed	1.5–1.8
Puppy (4–12 months)	2.0–2.5
Senior dog (7+ years)	1.2–1.4

Example Calculation

A neutered 20 kg adult dog with moderate activity:

• RER = 70 x 20^0.75 = 70 x 9.46 = 662 kcal
• MER = 662 x 1.6 = 1,059 kcal per day

This dog needs roughly 1,059 calories per day, split between two meals.

Step 3: Adjust for Real Life

Formulas provide a starting point, not a final answer. Every dog is unique, and real-world factors require fine-tuning.

Factors That Increase Caloric Needs

• Cold weather: Dogs in Montréal or other Canadian cities burn more calories in winter, especially if they spend significant time outdoors
• Pregnancy and lactation: Energy needs can double or triple
• Recovery from illness or surgery: Healing requires extra energy
• High-energy breeds: Border Collies, Huskies, and German Shepherds often need more than calculated

Factors That Decrease Caloric Needs

• Sedentary lifestyle: Apartment dogs with minimal exercise
• Spaying or neutering: Metabolism typically drops 20–30%
• Aging: Senior dogs need fewer calories but not less nutrition
• Obesity: Reduce intake to RER x 1.0 for safe weight loss

How to Measure Food Accurately

By Weight (Recommended)

Using a kitchen scale is the most accurate method. Measure your dog's food in grams rather than relying on scoops or cups.

By Volume (Less Accurate)

If you use a measuring cup, know that kibble density varies by brand. One cup of one brand may contain 300 kcal while another contains 450 kcal. Always check the caloric density on the packaging.

Caloric Density Comparison

Food Type	Approximate kcal per 100g
Dry kibble	300–400
Canned / wet food	80–130
Fresh cooked food	100–180
Raw food	120–200

Fresh food like Alqo's meals lists exact caloric content per portion, making measurement straightforward and reliable.

Monitoring and Adjusting Over Time

• Weigh your dog at least every two weeks during any diet change
• Assess body condition visually and by touch (you should easily feel ribs with light pressure)
• Recalculate after spaying/neutering, seasonal changes, activity level changes, or weight shifts of more than 5%

Key Takeaways

• RER x Activity Factor = Daily Caloric Needs — a simple, reliable starting formula
• Adjust for your dog's real life: activity, climate, health status, and body condition
• Weigh food for accuracy — cups and scoops are unreliable
• Monitor regularly and adjust portions based on weight and body condition changes
• Treats count — factor them into total daily calories
• When in doubt, consult your veterinarian for a personalized feeding plan

The right amount of food is not guesswork. A little math and consistent monitoring will keep your dog at a healthy weight for life.