What is the average weight of a fully grown Mastiff?

An adult male Mastiff typically weighs between 58-65kg, while females usually weigh between 46-54kg. These ranges can vary depending on genetics, diet, and activity level.

When do Mastiffs stop growing?

Large breeds like the Mastiff generally stop growing in height by 12 to 15 months, but may continue developing muscle and body mass until 18 to 24 months of age.

How much should a Mastiff weigh at 3, 6, and 12 months?

While every puppy is different, here are typical weight ranges for male Mastiffs: 3 months: 16-20kg 6 months: 37-43kg 12 months: 54-60kg

Is my Mastiff the right weight for their age?

Our weight calculator provides a guide based on typical growth ranges for the Mastiff. If your dog falls outside of these ranges, it doesn’t always mean something is wrong - but it may be worth checking with your vet for peace of mind.

What is the ideal height for a Mastiff?

Adult male Mastiffs typically stand between 66-70cm at the shoulder, while females range from 64-69cm. These measurements can vary slightly by individual.

How can I tell if my Mastiff is overweight or underweight?

A healthy Mastiff should have a visible waist when viewed from above, and you should be able to feel their ribs without pressing hard. If your dog seems noticeably round or has a sagging belly, it may be overweight. For confirmation, consult your vet.

Do male and female Mastiffs grow to the same size?

Not exactly. Male Mastiffs are generally a bit taller and heavier than females, but both sexes should fall within the expected ranges shown above to remain healthy.

Mastiff Weight & Height Calculator: Find the Ideal Growth for Your Mastiff

Predict your Mastiffs adult weight and height based on their current measurements!

What Is the Ideal Weight & Height for a Mastiff?

An adult Mastiff should weigh 58 - 65kg, whereas a female should weigh 46 - 54kg. Various factors can affect this, such as whether the dog is purebreed, or even if it is a working type or show type.

Male Mastiff Weight & Height Chart

Age (Months)	Weight (kg)	Height (cm)
2 Months	8 - 11 kg	25 - 30 cm
3 Months	16 - 20 kg	35 - 43 cm
4 Months	24 - 30 kg	50 - 58 cm
5 Months	32 - 37 kg	61 - 65 cm
6 Months	37 - 43 kg	63 - 67 cm
7 Months	42 - 48 kg	64 - 68 cm
8 Months	45 - 52 kg	65 - 69 cm
9 Months	48 - 54 kg	65 - 70 cm
10 Months	50 - 56 kg	66 - 70 cm
11 Months	52 - 58 kg	66 - 70 cm
12 Months	54 - 60 kg	66 - 70 cm
18 Months	56 - 63 kg	66 - 70 cm
24 Months	58 - 65 kg	66 - 70 cm

Female Mastiff Weight & Height Chart

Age (Months)	Weight (kg)	Height (cm)
2 Months	7 - 10 kg	24 - 29 cm
3 Months	14 - 18 kg	34 - 41 cm
4 Months	22 - 27 kg	48 - 55 cm
5 Months	28 - 33 kg	59 - 63 cm
6 Months	33 - 38 kg	61 - 65 cm
7 Months	36 - 41 kg	62 - 66 cm
8 Months	38 - 43 kg	63 - 67 cm
9 Months	40 - 45 kg	63 - 68 cm
10 Months	42 - 47 kg	64 - 68 cm
11 Months	43 - 48 kg	64 - 68 cm
12 Months	44 - 50 kg	64 - 68 cm
18 Months	45 - 52 kg	64 - 69 cm
24 Months	46 - 54 kg	64 - 69 cm

Disclaimer: The data provided on this page is given as a guide only and a qualified vet should be consulted with any concerns for your pets weight or other health issues

Is Your Mastiffs Weight Healthy for Its Height?

Monitoring your Mastiffs weight in relation to its height is essential for ensuring overall health and well-being. Every dog breed has an ideal weight and height range that helps to determine what is healthy. dogs weight falls within the typical range for its breed and height, it is likely in good shape. However, weight management can be a bit more nuanced.

For instance, a Mastiff that is taller than average may naturally weigh more without being overweight. Conversely, a shorter dog should typically weigh less. It's important to regularly assess your dogs body condition through a combination of weight, height, and visual checks, such as observing the waistline and feeling for ribs. If you're unsure, consult your vet to determine if your dog's weight is appropriate for its breed, size, and life stage. Healthy weight contributes to longevity, improved mobility, and reduced risk of conditions such as joint problems and heart disease.

By keeping an eye on your Mastiffs weight and height, you can help ensure they remain happy, active, and in optimal health throughout their life.

Frequently Asked Questions

What is the average weight of a fully grown Mastiff?
An adult male Mastiff typically weighs between 58-65kg, while females usually weigh between 46-54kg. These ranges can vary depending on genetics, diet, and activity level.
When do Mastiffs stop growing?
Large breeds like the Mastiff generally stop growing in height by 12 to 15 months, but may continue developing muscle and body mass until 18 to 24 months of age.
How much should a Mastiff weigh at 3, 6, and 12 months?
While every puppy is different, here are typical weight ranges for male Mastiffs:
- 3 months: 16-20kg
- 6 months: 37-43kg
- 12 months: 54-60kg
Is my Mastiff the right weight for their age?
Our weight calculator provides a guide based on typical growth ranges for the Mastiff. If your dog falls outside of these ranges, it doesn’t always mean something is wrong - but it may be worth checking with your vet for peace of mind.
What is the ideal height for a Mastiff?
Adult male Mastiffs typically stand between 66-70cm at the shoulder, while females range from 64-69cm. These measurements can vary slightly by individual.
How can I tell if my Mastiff is overweight or underweight?
A healthy Mastiff should have a visible waist when viewed from above, and you should be able to feel their ribs without pressing hard. If your dog seems noticeably round or has a sagging belly, it may be overweight. For confirmation, consult your vet.
Do male and female Mastiffs grow to the same size?
Not exactly. Male Mastiffs are generally a bit taller and heavier than females, but both sexes should fall within the expected ranges shown above to remain healthy.