Senior Dog Portions and Calorie Targets
Older dogs need about 20-30% fewer calories. Feeding amounts for senior dogs by weight from age 7 up — portions, kcal targets and slower-metabolism tweaks.
How Much Should You Feed a Senior Dog?
A senior dog eats at 1.4 x RER, which lands 12-20% below the adult 1.6 factor; a 75 lb (34 kg) senior therefore needs about 1,380 kcal per day, roughly 3.5 cups of a 400 kcal-per-cup food. Aging lowers daily energy needs because lean muscle shrinks and activity falls, while the digestive machinery still absorbs calories at full efficiency. Keep the adult portion in the bowl and the older dog gains weight on the same food that once maintained condition.
Breed size determines when a dog becomes senior: small breeds at about 10-12 years, medium breeds at 8-10, large breeds at 6-8 and giant breeds at 5-6. A 6-year-old Great Dane is a senior for feeding purposes while a 6-year-old Chihuahua is mid-adulthood. Apply the 1.4 factor from those thresholds, then let the scale confirm it; the senior dog calorie calculator runs the multiplier on your dog's exact weight.
Direction of error matters differently in seniors. Unplanned weight gain on unchanged portions signals the metabolic slowdown this page corrects for; unplanned weight loss on unchanged portions is a medical flag, not a feeding win, since kidney disease, dental pain and muscle wasting all present as a thinning senior. Reduce portions deliberately, and investigate any loss you did not plan.
Senior Dog Calories and Cups by Weight (Table)
The senior table converts kcal to cups at 400 kcal per cup using the 1.4 factor. A 75 lb senior dog needs about 1,380 kcal per day; a 15 lb senior needs about 415 kcal, roughly 1 cup.
Activity still moves the factor. Inactive or arthritic seniors trend toward a 1.2 factor, about 15% below the table; genuinely active seniors hold 1.4-1.6. Weigh every two weeks and shift the factor 0.1-0.2 in the direction the scale indicates. The mechanics of how RER and MER factors work are covered in the calorie explainer.
| Senior dog weight | RER (kcal) | Daily kcal (1.4 x RER) | Cups per day (400 kcal/cup) |
|---|---|---|---|
| 15 lb (6.8 kg) | ~296 | ~415 kcal | ~1 cup |
| 30 lb (13.6 kg) | ~496 | ~694 kcal | ~1.7 cups |
| 40 lb (18.2 kg) | ~624 | ~874 kcal | ~2.2 cups |
| 50 lb (22.7 kg) | ~729 | ~1,021 kcal | ~2.6 cups |
| 75 lb (34 kg) | ~986 | ~1,380 kcal | ~3.5 cups |
Protein Goes Up, Calories Go Down
Healthy senior dogs need more protein per calorie than young adults, not less. Target about 75 g of protein per 1,000 kcal, which is 25% or more of calories from protein, to counter sarcopenia, the age-driven loss of muscle mass. Adequate dietary protein slows that muscle loss; restricting protein in a healthy senior accelerates it. Protein restriction belongs only to diagnosed kidney disease under veterinary direction.
Read labels with that number in hand, because the word senior on a label is not defined by AAFCO. Senior diets are unregulated as a category: some run lower calorie and higher protein, others are simply adult food with new packaging. Check the kcal per cup and the protein content, not the label word. Pair the lower calorie target with a body condition check every month; the guide to checking whether your older dog is overweight shows the rib and waist landmarks to use.
Check the number on any candidate bag in one step: divide the protein grams per cup by the kcal per cup and multiply by 1,000. A food with 30 g protein in a 380 kcal cup delivers 79 g per 1,000 kcal, above the 75 g senior target; a food at 22 g in a 420 kcal cup delivers only 52 g and fails the check regardless of what the front of the bag says.
Wet and Soft Food for Senior Dogs
Soft food supports senior dogs with dental disease, missing teeth or a fading thirst drive, since wet food is 75-82% water. The portion math does not change: cans per day equal daily kcal divided by kcal per can. A 40 lb (18.2 kg) senior needs about 874 kcal per day, which is about 2.5 x 13-oz cans at 350 kcal per can.
Wet-for-dry swaps are made by matching calories, never volume. A 14-year-old small dog on soft food follows the same table row as before, converted at the new food's density: a 15 lb senior at about 415 kcal eats roughly 1.2 large cans or 2.4 small 5.5-oz cans. If a senior is carrying extra weight into old age, trim it deliberately; the plan for trimming weight off an older dog pairs the 1.0-1.2 factor with joint-sparing exercise.
Two serving details help older eaters: warm refrigerated wet food to room temperature to restore aroma, and raise the bowl for dogs with neck or joint stiffness. Neither changes the calorie math; both change whether the meal gets eaten.
Is a 1-2 Year Old Dog a Senior? Feeding Between Life Stages
No, a 1-2 year old dog is a young adult, not a senior. Feed the 1.6 neutered-adult factor once growth ends, and growth completion is what triggers the switch to adult factors: small breeds finish at about 10-12 months while giant breeds keep growing until 18-24 months. The practical marker is 80% of expected adult weight; at that point step down from puppy factors toward adult amounts.
A 2-year-old dog eating puppy-level portions gains weight fast, because the 2.0 growth factor exceeds adult needs by 25%. Move to the adult dog portion guide numbers at maturity, and remember that neutering cuts the requirement at the same time; why neutering cuts calorie needs explains the 25-30% metabolic drop. From there the 1.4 senior factor waits years away. Whenever your dog crosses a life-stage line, recalculate rather than estimate: the calorie calculator applies the right multiplier to your dog's current weight in seconds.
Frequently asked questions
- How many calories should a senior dog eat?
- About 1.4 x RER, where RER = 70 x kg^0.75. A 20 lb senior needs about 515 kcal per day and a 75 lb senior about 1,380 kcal, roughly 12-20% below the adult target at the same weight.
- How much do you feed a 75 lb senior dog?
- About 1,380 kcal per day, which is roughly 3.5 cups of a 400 kcal-per-cup food split into two meals. Feed less, toward a 1.2 factor, if the dog is inactive or carrying extra weight.
- Should senior dogs eat less protein?
- No. Healthy seniors need more protein per calorie, about 75 g per 1,000 kcal, to slow age-related muscle loss. Protein restriction applies only to diagnosed kidney disease under veterinary guidance.