How much should I feed a 20kg dog?

Resting energy for a 20kg dog is around 662 kcal, and a typical neutered adult at normal activity needs close to 1.6 times that, about 1,060 kcal a day. At 350 to 400 kcal per 100g of dry food, that works out to roughly 265 to 285g.

Breeds at this weight range from stocky, muscular builds to leaner, more athletic ones, and muscle mass affects how many calories a dog burns even at rest, so two 20kg dogs can genuinely need different amounts.

A stocky, muscular breed at 20kg often needs slightly more than the baseline because muscle tissue is more metabolically active than fat, while a leaner, lower muscle breed at the same weight may need slightly less.

This is one reason two dogs eating the exact same amount can end up at very different body conditions, and why body condition checks matter more than chasing an exact universal number.

Start at the calculated midpoint, hold it for two to three weeks, and check the waist and ribs before making any change.

If your 20kg dog is a rescue of unknown breed mix, treat the first month as a trial period and expect to adjust once you see how the body responds. Photographing your dog from above at the same time each week during this trial period makes small shifts easier to catch early.