Question 1

How much should a English Mastiff weigh?

Accepted Answer

The ideal weight for a English Mastiff is 174.2–220.5 lbs (79–100 kg). Giant breeds have slower metabolisms, so weight management is especially important.

Question 2

How many calories does a English Mastiff need per day?

Accepted Answer

A typical adult English Mastiff weighing about 197 lbs (90 kg) needs approximately 3259–4074 kcal per day, depending on activity level and neuter status.

Question 3

Is my English Mastiff overweight?

Accepted Answer

59% of dogs are overweight. Check your English Mastiff'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

When do English Mastiffs stop growing?

Accepted Answer

Most English Mastiffs 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 English Mastiff is growing at a healthy rate.

Question 5

How can I tell if my English Mastiff is overweight?

Accepted Answer

Check three signs: (1) You can't feel your English Mastiff'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 English Mastiff may be carrying extra weight. Use the Body Condition Score checker above for a quick assessment, or consult your vet.

Question 6

How much should a English Mastiff puppy weigh at 3 months?

Accepted Answer

A 3-month-old English Mastiff typically weighs 69.7–110.2 lbs (31.6–50.0 kg). Use our Puppy Weight Predictor to estimate your puppy's adult weight based on current age and weight.

Question 7

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

Accepted Answer

Adult English Mastiffs typically need 3259–4074 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 8

How much exercise does a English Mastiff need?

Accepted Answer

English Mastiffs 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	174.2–220.5 lbs (79–100 kg)
Full Growth	18–24 months
Daily Calories	~3259–4074 kcal (adult, neutered)

English Mastiff Weight & Calorie Guide

Quick Facts

Ideal Weight Range

English Mastiff Calorie Calculator