Bullmastiff Weight & Growth Chart

Complete weight guide with growth charts for male and female Bullmastiffs from puppy to adult.

Male Adult Weight

100–130 lbs

Female Adult Weight

85–114 lbs

Bullmastiff Weight Overview

A fully grown Bullmastiff weighs between 100 and 130 pounds. Males range 100–130 lbs; females 85–114 lbs.

Males weigh 110-130 pounds, females 100-120 pounds; the breed should be powerfully built but not excessively heavy or lacking in agility..

Growth Chart

When Does a Bullmastiff Stop Growing?

Most Bullmastiffs reach adult height of 24–27 inches by 15–24 months, with full body weight of 100–130 lbs achieved shortly after. Males fill out to 130 lbs while females reach 114 lbs.

Growth rate is influenced by genetics, diet quality, and spay/neuter timing. Moderate exercise needs of 30-45 minutes daily; prefers shorter walks and play sessions, and is prone to overheating due to their brachycephalic tendencies..

Is My Bullmastiff Overweight?

Is your Bullmastiff at a healthy weight? The ideal range is 100–130 lbs (males 100–130, females 85–114). Check these three signs:

Ribs: Easily felt with light pressure; not visible but not buried under fat
Waistline: A clear narrowing behind the ribs when viewed from above
Abdominal tuck: The belly slopes upward from the ribcage to the hind legs when viewed from the side

If your dog fails any of these checks, consult your vet. Cancer, particularly lymphoma, is the breed's most pressing health concern; regular checkups and awareness of warning signs like swollen lymph nodes are essential..

Feeding Recommendation

Plan on 1.5–2.6 cups of premium dry food daily for your adult Bullmastiff, divided into morning and evening meals. Given this working breed's predisposition to Lymphoma, discuss dietary approaches that may help manage this risk with your vet. Males weigh 110-130 pounds, females 100-120 pounds; the breed should be powerfully built but not excessively heavy or lacking in agility..

Weight by Age Table

Age	Male (lbs)	Female (lbs)
3 months	23.8–28.2	20.1–24.1
6 months	53.4–63.6	45.3–54.1
9 months	77.2–91.8	65.4–78.2
12 months	95.0–113.0	80.5–96.3
18 months	112.8–134.2	95.6–114.3
24 months	118.8–141.2	100.7–120.3

Frequently Asked Questions

Males: 100–130 lbs. Females: 85–114 lbs. Males weigh 110-130 pounds, females 100-120 pounds; the breed should be powerfully built but not excessively heavy or lacking in agility.. Consult your vet for a personalized assessment.

The Bullmastiff reaches full adult size (24–27 inches, 100–130 lbs) by approximately 18–24 months. Moderate exercise needs of 30-45 minutes daily; prefers shorter walks and play sessions, and is prone to overheating due to their brachycephalic tendencies.. Early spay/neuter may slightly delay growth plate closure in this giant-sized breed.

Three quick checks for your Bullmastiff: (1) Feel the ribs–they should be easily palpable under a thin fat layer. (2) View from above–there should be a visible waist behind the ribs. (3) Side profile–the abdomen should tuck up. Target weight: 100–130 lbs. Their short coat can make visual assessment harder, so hands-on rib checks are especially important. Consult your vet for a body condition score.

Start with the food label's guidelines for your puppy's current weight and adjust based on body condition. Bullmastiff puppies should eat 3–4 meals daily until 6 months, then transition to twice daily. Given the breed's predisposition to Lymphoma, your vet may recommend specific dietary considerations. Target adult weight is 100–130 lbs (100–130 for males, 85–114 for females).

A Bullmastiff puppy not gaining weight needs veterinary attention. Expected growth milestones lead to an adult weight of 100–130 lbs (males 100–130, females 85–114). Possible causes: parasites, insufficient calorie density in food, stress, or underlying conditions. Ensure the puppy is eating without competition from littermates or other pets.