Puppy feeding charts / Working group
Puppy growth · Working group
Bullmastiff puppy feeding chart
A Bullmastiff grows to about 130 lb (the standard's range is 110–130 lb). Puppy calories track the puppy's current weight, not its adult weight: 20 lb of puppy under four months needs about 1098 kcal a day, and the daily total keeps rising until adult weight, when the factor drops and the dog needs 2383 kcal — fewer calories than it did at 52 lb as a growing puppy (1498 kcal).
- 1Under 4 months 20 lb · 1098 kcal
- 2Most calories 111 lb · 2646 kcal
- 3Adult 130 lb · 2383 kcal
Chart: calories and cups as the puppy grows
Weigh the puppy, find the nearest row, feed that amount split into three or four meals under four months and two or three after. Re-weigh every two weeks. Cups use 369 kcal/cup (Purina Pro Plan Complete Essentials Shredded Blend Chicken & Rice (adult dry)); puppy foods are often denser, so use the kcal/cup on your bag — the sizer accepts it.
| Share of adult weight | Puppy weighs | Stage | Factor | kcal/day | Cups at 369 | Grams |
|---|---|---|---|---|---|---|
| 15% | 20 lb (9.1 kg) | Puppy, under 4 months | × 3 | 1098 | 3 | 288 g |
| 25% | 33 lb (15.0 kg) | Puppy, under 4 months | × 3 | 1598 | 4¼ | 408 g |
| 40% | 52 lb (23.6 kg) | Puppy, 4 months to adult | × 2 | 1498 | 4 | 384 g |
| 55% | 72 lb (32.7 kg) | Puppy, 4 months to adult | × 2 | 1913 | 5¼ | 504 g |
| 70% | 91 lb (41.3 kg) | Puppy, 4 months to adult | × 2 | 2280 | 6¼ | 600 g |
| 85% | 111 lb (50.3 kg) | Puppy, 4 months to adult | × 2 | 2646 | 7¼ | 696 g |
| 100% | 130 lb (59.0 kg) | Adult, neutered | × 1.6 | 2383 | 6½ | 624 g |
RER = 70 × kg0.75; puppy and adult factors from the Merck Veterinary Manual. The age split (four months) is Merck's; the weight shares are evenly spaced points for reading the curve, not growth milestones for this breed. Calorie density: Purina. Checked 2026-10-20.
Where the stages fall for a Bullmastiff
The 3× factor applies while the puppy is under four months, which for a Bullmastiff usually means the rows up to roughly a quarter or a third of adult weight — around 20–33 lb. Between four months and maturity the factor is 2×, covering the 52–111 lb rows. Large and giant breeds like this one keep growing well past a year, and large-breed puppy foods are formulated to slow that growth slightly for joint health; the calorie math is the same, the food choice is the vet conversation.
The peak of the chart is the surprise for most owners: at 52 lb and 2× RER the puppy eats 1498 kcal, but the same dog at its full 130 lb as a neutered adult needs only 2383 kcal. Watch for the hand-off and reduce the ration rather than letting the adult food amount "catch up".
Growth to watch in a Bullmastiff
The standard puts an adult Bullmastiff at 25–27 in at the withers (24–26 in for females), so a puppy at the 72 lb row — a little over half its adult weight — is typically most of the way to full height and still filling out. Because females of the breed finish around 120 lb rather than 130 lb, a female puppy's rows stop short: read the chart to about 102 lb before switching to the adult factor. At this adult size the 2× stage lasts longest and the kcal totals run past 2646, so buy puppy food by the large bag and weigh it in grams.
Crate divider positions
The same growth rows are a guide for the divider in the adult-size crate. A Bullmastiff ends up in a 54 in crate — see the Bullmastiff crate size page — and the divider should give the puppy only enough room to stand, turn around and lie flat at each stage, moving back roughly every re-weigh.
Compare with similar breeds
A Black Russian Terrier puppy at 52 lb (40% of its 130 lb adult weight) needs 1498 kcal; A Tibetan Mastiff puppy at 60 lb (40% of its 150 lb adult weight) needs 1668 kcal; A Rottweiler puppy at 53 lb (40% of its 132 lb adult weight) needs 1520 kcal.
Adult weight from AKC breed standard (PDF), checked 2026-10-21. Maintenance figures for a healthy puppy; your vet's growth-curve advice comes first.