Question 1

How much should a Bullmastiff weigh?

Accepted Answer

The ideal weight for a Bullmastiff is 90.4–130.1 lbs (41–59 kg). Giant breeds have slower metabolisms, so weight management is especially important.

Question 2

How many calories does a Bullmastiff need per day?

Accepted Answer

A typical adult Bullmastiff weighing about 110 lbs (50 kg) needs approximately 2106–2632 kcal per day, depending on activity level and neuter status.

Question 3

Is my Bullmastiff overweight?

Accepted Answer

59% of dogs are overweight. Check your Bullmastiff's Body Condition Score (BCS) — if you can't easily feel their ribs or they have no visible waist, they may be overweight. Take our free 2-minute BCS assessment.

Question 4

How big does a Bullmastiff get?

Accepted Answer

A full-grown Bullmastiff stands 61–69 cm (24.0–27.2 inches) tall and weighs 90.4–130.1 lbs (41–59 kg).

Question 5

What is the lifespan of a Bullmastiff?

Accepted Answer

The average lifespan of a Bullmastiff is 7–9 years. Giant breeds typically have shorter lifespans.

Question 6

When do Bullmastiffs stop growing?

Accepted Answer

Most Bullmastiffs reach their full adult weight between 18 and 24 months of age. Giant breeds are the slowest to mature and can keep growing until 18–24 months. Use the growth milestones section above to track if your Bullmastiff is growing at a healthy rate.

Question 7

How can I tell if my Bullmastiff is overweight?

Accepted Answer

Check three signs: (1) You can't feel your Bullmastiff's ribs easily under the fur. (2) From above, there's no visible waist behind the ribs. (3) From the side, the belly doesn't tuck up after the chest. If any of these apply, your Bullmastiff may be carrying extra weight. Use the Body Condition Score checker above for a quick assessment, or consult your vet.

Question 8

How much should a Bullmastiff puppy weigh at 3 months?

Accepted Answer

A 3-month-old Bullmastiff typically weighs 36.2–65.0 lbs (16.4–29.5 kg). Use our Puppy Weight Predictor to estimate your puppy's adult weight based on current age and weight.

Question 9

What is the best diet for a Bullmastiff to maintain healthy weight?

Accepted Answer

Adult Bullmastiffs typically need 2106–2632 calories per day, depending on activity level. Feed a high-quality dog food appropriate for their life stage (puppy, adult, or senior) and size. Use our Calorie Calculator for a personalized daily food amount recommendation.

Question 10

How much exercise does a Bullmastiff need?

Accepted Answer

Bullmastiffs are a giant-sized breed and typically need 45–60 minutes of exercise per day. This includes walks, play time, and mental stimulation. Adjust based on your dog's age and health — puppies need shorter, gentler sessions while healthy adults can handle more.

Weight Range	90.4–130.1 lbs (41–59 kg)
Height	61–69 cm (24.0–27.2 inches)
Full Growth	18–24 months
Daily Calories	~2106–2632 kcal (adult, neutered)

Bullmastiff Weight & Calorie Guide

Quick Facts

Ideal Weight Range

Bullmastiff Calorie Calculator