Feeding by breed and weight / by weight
How much to feed a 120 lb dog
A 120 lb (54.4 kg) dog has a resting energy requirement of 1403 kcal. As a neutered adult with normal activity that becomes 2244 kcal a day, or 6 cups of a 369 kcal/cup kibble; an intact adult needs 2525 kcal, and a dog that is inactive or gains weight easily 1964 kcal. Puppies that currently weigh 120 lb need far more: 4208 kcal under four months, 2806 kcal after.
120 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 | 2244 | 6 | 7½ | 5 | 576 g |
| Intact adult, normal activity | × 1.8 | 2525 | 6¾ | 8½ | 5½ | 648 g |
| Adult, inactive or prone to weight gain | × 1.4 | 1964 | 5¼ | 6½ | 4¼ | 504 g |
| Puppy under 4 months | × 3 | 4208 | 11½ | 14 | 9¼ | 1104 g |
| Puppy 4 months to adult size | × 2 | 2806 | 7½ | 9¼ | 6¼ | 720 g |
RER = 70 × 54.40.75 = 1403 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 120 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 281 kcal — about 0.8 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 120 lb dog
A 120 lb dog is above the manufacturer's largest crate band (110 lb), so look at 54 in crates and measure, 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 120 lb
- Rottweiler (110–132 lb)
- Great Dane (110–180 lb)
- Bernese Mountain Dog (80–120 lb)
- Great Pyrenees (120–165 lb)
- Saint Bernard (120–200 lb)
- Akita (American) (100–130 lb)