How Many Calories Does My Dog Really Need?

Nutrition · 5 min read

Generic feeding charts on the back of dog food bags are based on average dogs. But no dog is average. A 30 lb French Bulldog and a 30 lb Border Collie have wildly different calorie requirements because of their breed-specific metabolic rates and activity levels.

The RER Formula

The gold-standard starting point is the Resting Energy Requirement formula from the National Research Council (2006):

RER = 70 × (body weight in kg)^0.75

This gives the calories your dog burns at complete rest. The exponent of 0.75 accounts for the metabolic scaling law — smaller animals burn more energy per kilogram than larger ones.

Breed-Specific Adjustments

From the RER, actual daily needs (Maintenance Energy Requirement) are calculated by multiplying by factors for life stage, activity level, neuter status, and a breed-specific metabolic modifier. Brachycephalic breeds like Bulldogs tend to need fewer calories per pound than high-energy herding breeds like Border Collies.

Try it yourself with our Breed Calorie Calculator — enter your dog's exact breed, weight, and activity level for a personalized result in seconds.

Why the "Multiply by 7" Dog Age Rule Is Wrong

Aging · 4 min read

The idea that one dog year equals seven human years has been repeated for decades, but it doesn't hold up to science. In reality, dogs age non-linearly, and the rate depends heavily on body size.

How Dogs Really Age

Research — including a landmark 2020 study published in Cell Systems — shows that dogs age most rapidly in their first two years. A 1-year-old dog of any size is roughly equivalent to a 15-year-old human, and a 2-year-old is roughly 24. After that, the rate diverges by size:

• Small breeds (under 20 lbs): add about 4 human years per dog year after age 2
• Medium breeds (20–50 lbs): add about 5
• Large breeds (50–90 lbs): add about 6
• Giant breeds (over 90 lbs): add 7–8

This means a 5-year-old Chihuahua is about 36 in human years, while a 5-year-old Great Dane is about 45. Use our Breed Age Calculator to see the exact conversion for your dog's breed.

Predicting Your Puppy's Adult Weight

Puppies · 4 min read

When you bring home a puppy — especially a mixed breed — one of the first questions is: "How big will they get?" Breed-specific growth curves make surprisingly accurate predictions.

Growth Curves by Size

Dogs don't grow at a constant rate. Small breeds finish growing much earlier than large and giant breeds:

• Toy/Small: reach ~99% of adult weight by 10–12 months
• Medium: by 12–16 months
• Large: by 16–18 months
• Giant: may keep growing until 18–24 months

At 4 months old, a puppy is typically at about 30% (small breed) to 50% (large breed) of their adult weight. Our Breed Weight Calculator uses these curves combined with your puppy's current weight to project their adult size with a confidence range.

Indoor vs. Outdoor: Feeding Your Cat Correctly

Cats · 4 min read

A 10 lb indoor Persian and a 10 lb outdoor Bengal have very different calorie needs — and it's not just because of exercise.

Why Indoor Cats Need Fewer Calories

Indoor cats are typically less active, have more stable body temperatures (no cold-weather energy expenditure), and tend toward a more sedentary lifestyle. Studies suggest indoor cats need 15–20% fewer calories than outdoor cats of the same breed and weight.

Breed-Specific Metabolism

Breed matters too. Active breeds like Bengals and Abyssinians naturally burn more energy, even indoors, than calm breeds like Persians and Ragdolls. Our Cat Calorie Calculator accounts for both environment (indoor/outdoor) and breed-specific metabolic factors to give you a personalized daily calorie target.

Dog Pregnancy Week by Week: What to Expect

Breeding · 5 min read

Canine pregnancy lasts an average of 63 days — just 9 weeks. Here's what happens at each stage:

• Week 1–2 (Days 1–14): Fertilization and early cell division. No external signs yet.
• Week 3 (Days 15–21): Embryos implant in the uterine wall. Some dogs may show decreased appetite or mild nausea.
• Week 4 (Days 22–28): Heartbeats can be detected by ultrasound around day 25. A vet visit for confirmation is recommended.
• Week 5 (Days 29–35): Fetal sex can be determined. Toes, claws, and whiskers begin forming.
• Week 6–7 (Days 36–49): Rapid fetal growth. The dam's abdomen visibly enlarges. Increase food by ~25% from week 5.
• Week 8 (Days 50–57): Puppies can be felt moving. Nesting behavior begins. Radiography can confirm litter count.
• Week 9 (Days 58–65): Whelping can begin any time. Watch for temperature drop (~1°F) signaling labor within 24 hours.

Track every milestone automatically with our Breeding Calculator — just enter the breed and mating date.

Top 10 Most Popular Dog Breeds and Their Care Needs

Breeds · 6 min read

Each breed has unique nutritional, exercise, and health requirements. Here's a quick overview of the 10 most popular breeds and what makes them different:

• Labrador Retriever — Active, food-driven, prone to obesity. Needs careful portion control and high activity.
• French Bulldog — Brachycephalic with lower metabolic rate. Overheating risk; needs moderate exercise and fewer calories per pound.
• Golden Retriever — Large, active breed. Benefits from joint supplements and moderate-to-high calorie intake.
• German Shepherd — High energy, working breed. Needs structured exercise and above-average calorie intake.
• Poodle — Comes in 3 sizes with different calorie needs. Intelligent; needs mental stimulation alongside physical exercise.
• Beagle — Scent hound with strong food drive. Prone to weight gain without portion control.
• Rottweiler — Large, muscular breed. Higher calorie needs but careful monitoring for joint health.
• Dachshund — Small but prone to back problems. Maintaining healthy weight is critical for spine health.
• Yorkshire Terrier — Toy breed with high metabolism per pound. Small frequent meals recommended.
• Siberian Husky — Very active, cold-weather breed. Surprisingly efficient metabolism — needs fewer calories than their energy level suggests.

Explore all 400+ breeds in our Breed Directory and calculate breed-specific calorie, age, or weight results with our free calculators.