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Energy needs drop after neutering
Life-stage factors are ranges commonly used in veterinary nutrition, not a fixed legal value · individual animals vary by more than 20%, so weigh every two weeks and adjust · follow your veterinarian’s guidance for illness, pregnancy, or nursing.
Double the weight isn’t double the food
Calorie needs scale with body weight to the 0.75 power, not weight itself — doubling body weight only raises calorie needs by about 1.68×. Estimating with a flat “weight × grams” rule overfeeds large animals and underfeeds small ones.
Same weight, life stage still doubles the gap
A growing puppy needs about 3× resting energy, a neutered adult dog about 1.6×, one on a weight-loss plan closer to 1×. The feeding chart on a food bag rarely says which life stage it assumes, so using it as-is for a neutered adult usually overfeeds.
Check the “kcal per 100g” on the bag
Calorie density varies a lot by product, so the same gram amount isn’t the same calories. Dry food usually runs 330–400kcal per 100g, wet food closer to 70–110kcal. Enter the metabolizable energy (ME) printed on the bag to convert calories into grams. If you mix wet and dry, calculate each separately.
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Frequently asked questions
QIs this the exact right amount for my pet?
No — individual animals vary by more than 20% even at the same weight and life stage. Treat this as a starting point, weigh your pet every two weeks, and adjust up or down based on the trend.
QWhere do the life-stage factors come from?
They’re the ranges commonly used in veterinary nutrition texts and guidelines, not a legally fixed number. If your pet is sick, pregnant, or nursing, follow your veterinarian’s guidance instead.