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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.
1 Start by determining your daily calorie need and divide that number in half. That's how many calories should come from carbohydrates. 2  Each gram of carbohydrate has four calories. Divide the number you got from the first step by four.  The final number is equal to the amount of carbohydrates in grams you need each day.