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Bullmastiff Size & Weight Chart

Dr Shamsul Alam Roky
Reviewed by:
Dr. Shamsul Alam Roky
Veterinarian

The Bulldog-Mastiff cross can be a physically imposing breed and is considered to be one of the larger dog breeds. But how big can you expect a Bullmastiff to get?

Keep reading to find out all you need to know about the size and weight of your future Bullmastiff.

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How Big Is a Bullmastiff Dog?

According to the breed standards of the American Kennel Club (AKC), a male Bullmastiff can measure somewhere between 63 cm and 68 cm at the withers and can weigh anywhere between 50 kg and 60 kg, making it a rather large dog.

A female Bullmastiff’s height at the withers typically lies between 60 cm to 66 cm, and they can weigh between 45 kg and 54kg.

Their overall size can vary according to diet and lifestyle, but because they are the opposite of high-energy dogs like the Jack Russell, they tend to stay more consistent in terms of size and weight.
 

At What Age Does a Bullmastiff Reach Its Full Size?

The Bullmastiff’s body will stop growing when it is between 18 to 20 months old. Some Bullmastiffs may continue growing into their second birthday, but this will more than likely be weight gain and not in terms of height.
 

What Is the Ideal Weight For a Bullmastiff?

The ideal weight for your Bullmastiff is between 50 kg to 60 kg if it’s male or 45 kg to 54 kg if it’s female. Ensuring your Bullmastiff maintains an ideal weight is key to avoiding unnecessary health problems and increasing its life expectancy.

Hip and elbow dysplasia are examples of health conditions that can be the result of your Bullmastiff’s size.

How to Make Sure Your Bullmastiff Isn’t Overweight

Because this large breed requires such a high-calorie diet, they need enough exercise to prevent them from putting on too much weight. Canine sports can make a good alternative to your typical short walks if your dog needs to shed some excess weight and can prevent them from getting bored.

Be sure to avoid implementing vigorous exercise immediately after your pooch has eaten, as it can cause life-threatening conditions such as gastric torsion or bloat.

Feeding a Bullmastiff puppy or an adult dog high-quality dog food is also extremely important for improving your dog’s quality of life. The higher quality foods give dogs a good balance of minerals without unnecessary fillers.
 

Ensuring Your Bullmastiff Grows Properly

Early training from a young age is important if you want your Bullmastiff to reach its maximum potential, and Bullmastiff puppies need to begin training when they are between 8 to 10 weeks old. In this case, training refers to reinforcing good eating and exercise habits.

Diet

Bullmastiffs have a reputation for being somewhat picky eaters, so you might have to tailor your dog’s diet according to how it reacts to certain foods and what is most healthy.

For Bullmastiff puppies, large-breed puppy food generally works best, and you can implement food puzzles to provide entertainment while preventing overeating.

Exercise

In comparison to other breeds, Bullmastiffs are low-energy dogs, so you have to encourage them to exercise from the time they are puppies. Be sure to reward your puppy by giving it stimulating chew toys instead of treats to prevent unnecessary weight gain.
 

FAQs

Are Bullmastiffs the heaviest breed?

No. While Bullmastiffs are large, their relative, the English Mastiff, is substantially heavier.

How much should I feed my Bullmastiff?

The recommended portion for an adult Bullmastiff is 3 1/8 to 4 1/8 cups daily, divided into two meals. This amount can vary according to a dog’s age, activity levels and gender.

Can a Bullmastiff live indoors?

Despite their size, Bullmastiffs can be highly affectionate dogs that can live inside and make good family members. Early socialisation with kids, pets, and other dogs will highly be beneficial in this sense.
 

Final Thoughts on Bullmastiff Size & Weight

The Bullmastiff breed makes loveable and sturdy guard dogs for your home, but in order for this to be the case, you need to pay close attention to their size and weight. Before purchasing one, be sure to familiarise yourself with the breed standards, requirements, and key health issues such as hip dysplasia.

If you need extra help for training, exercising, and feeding your pooch, then be sure to consult any nearby breed clubs that may have programmes specifically designed to feed and exercise Bullmastiffs.

Learn more about: Bullmastiff Dog Breed Information

Other helpful information

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