Feeding by breed and weight / by weight
How much to feed a 100 lb dog
A 100 lb (45.4 kg) dog has a resting energy requirement of 1223 kcal. As a neutered adult with normal activity that becomes 1958 kcal a day, or 5¼ cups of a 369 kcal/cup kibble; an intact adult needs 2202 kcal, and a dog that is inactive or gains weight easily 1713 kcal. Puppies that currently weigh 100 lb need far more: 3670 kcal under four months, 2447 kcal after.
100 lb dog feeding table
| Life stage / activity | Factor | kcal/day | Cups at 369 | Cups at 300 | Cups at 450 | Grams (96 g/cup) |
|---|---|---|---|---|---|---|
| Neutered adult, normal activity | × 1.6 | 1958 | 5¼ | 6½ | 4¼ | 504 g |
| Intact adult, normal activity | × 1.8 | 2202 | 6 | 7¼ | 5 | 576 g |
| Adult, inactive or prone to weight gain | × 1.4 | 1713 | 4¾ | 5¾ | 3¾ | 456 g |
| Puppy under 4 months | × 3 | 3670 | 10 | 12¼ | 8¼ | 960 g |
| Puppy 4 months to adult size | × 2 | 2447 | 6¾ | 8¼ | 5½ | 648 g |
RER = 70 × 45.40.75 = 1223 kcal. Factors: Merck Veterinary Manual. The 369 kcal/cup column is Purina Pro Plan Complete Essentials Shredded Blend Chicken & Rice (adult dry) (369 kcal/cup per Purina's label); the 300 and 450 columns bracket the usual range printed on adult dry foods. Checked 2026-10-20.
Reading the table
Pick the row that describes the dog, then the column that matches the kcal per cup on your bag — it is printed near the guaranteed analysis, usually as "kcal/cup" or "kcal ME/cup". The puppy rows apply to a puppy that weighs 100 lb today; a growing puppy should be re-weighed and the amount recalculated every two weeks, which the breed puppy charts do for you. At this size the gap between the neutered and intact rows is 244 kcal — about 0.7 cups a day — so the right row matters more than the brand of food.
These are maintenance starting points for a healthy dog. Weigh the dog monthly and check body condition — ribs easy to feel, visible waist — and adjust by about 10% if it is drifting. Pregnant or nursing dogs, working dogs and dogs with a diagnosed condition need a vet's number, not a table.
Other sizes for a 100 lb dog
By the manufacturer's weight bands a 100 lb dog takes a 48 in crate (Extra Large, 47.76 × 29.6 × 31.7 in interior; measure the dog's length to confirm), and a X-Large rectangle bed (53 × 35 in) on Orvis's chart. Harness size depends on chest girth rather than weight — see the harness size chart.
Breeds whose standard weight includes 100 lb
- Doberman Pinscher (90–100 lb)
- Cane Corso (100–110 lb)
- Bernese Mountain Dog (80–120 lb)
- Akita (American) (100–130 lb)