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This table is based upon a dog's Resting Energy Requirements or RER. The RER is the basic amount of energy that a dog would use in a day while remaining at rest. The formula to calculate RER for animals between 2 and 45 kg (5 - 99 pounds) is: RER in kcal/day = 30(body weight in kilograms) + 70. Any activity or variable other than rest will require an increase in energy (RER) and an increase in calories to meet the energy needs. Realize that these numbers are not a reflection of maintenance calories but of resting energy levels.
The Basic Equation. Begin by multiplying your total daily calories by 45 percent and then multiply the total daily calories by 65 percent. These two numbers provide the range of calories that should come from carbohydrates. Then, divide both of those numbers by 4, since each gram of carbohydrate contains 4 calories. The two numbers you get from this equation provide the range of carbohydrate grams you should eat per day.