The feeding chart on the back of the dog food bag is a starting point, not a prescription. It's calibrated for a generic, moderately active adult dog—which describes very few actual pets. Your dog's ideal daily intake depends on their weight, age, activity level, reproductive status, breed metabolism, and health conditions. Getting this right makes a meaningful difference over months and years.
Why bag guidelines often overfeed
Pet food companies have a financial incentive to suggest feeding slightly more. More food consumed means more bags purchased. Independent studies have shown that following bag guidelines exactly often results in gradual weight gain in less active dogs. A couch-dwelling 10-pound Shih Tzu has dramatically different calorie needs than an active 10-pound Jack Russell Terrier—but the bag treats them identically.
The right starting point: Resting Energy Requirement (RER)
Veterinary nutritionists use a formula called Resting Energy Requirement as the foundation for feeding calculations:
RER (kcal/day) = 70 × (body weight in kg)0.75
This gives you the calories your dog needs just to exist—breathing, organ function, cell repair. From there, a multiplier is applied based on life stage and activity:
- Intact adult: RER × 1.8
- Spayed/neutered adult: RER × 1.6
- Active adult: RER × 2.0–5.0
- Puppy (under 4 months): RER × 3.0
- Puppy (4 months to adult): RER × 2.0
- Weight loss: RER × 1.0 (feed at ideal weight, not current weight)
- Senior (7+, low activity): RER × 1.4
Quick reference by size
Here are rough starting ranges for a typical spayed/neutered adult dog at normal activity. These are estimates—your dog may need more or less:
- Toy breeds (under 10 lbs): 200–375 kcal/day
- Small breeds (10–20 lbs): 375–575 kcal/day
- Medium breeds (20–50 lbs): 575–1,000 kcal/day
- Large breeds (50–90 lbs): 1,000–1,600 kcal/day
- Giant breeds (90+ lbs): 1,600–2,500+ kcal/day
To convert kcal/day to cups, divide by the calories per cup listed on your food's packaging (usually found on the guaranteed analysis or nutritional adequacy statement).
Puppies: more frequent, more complex
Puppies need significantly more calories per pound of body weight than adults because they're growing rapidly. Large and giant breed puppies are a special case: overfeeding them actually causes developmental problems, because rapid growth puts excessive stress on developing joints. Large breed puppies should be fed large-breed specific puppy food, which has controlled calcium and phosphorus levels.
Puppies under 6 months should typically eat 3–4 times per day. After 6 months, twice a day is usually sufficient.
Senior dogs: it depends
Senior dogs are often assumed to need fewer calories—and many do, because activity drops with age. But some senior dogs actually struggle to maintain weight due to reduced digestion efficiency or health conditions. Don't automatically cut calories for an older dog without monitoring their weight and body condition first.
The most important thing: watch your dog, not just the numbers
No formula is a substitute for observation. Weigh your dog monthly. Check their body condition (rib test, waist check) every few weeks. If they're gaining weight on the calculated amount, reduce by 10%. If they're losing weight unexpectedly, see your vet.
Treats are where most owners underestimate intake. If treats make up more than 10% of daily calories, the main meal should be reduced accordingly. Logging treats in Pet AI as part of your daily total makes this easy to track.
How Pet AI helps you dial it in
Pet AI lets you set a calorie target for your dog based on their profile, then tracks every meal—including treats—against that target. The AI assistant can help you calculate an appropriate target based on your dog's specific details, and the weight tracking feature shows you whether the current plan is actually working over time.