The Bullmastiff is a large British mastiff-type large dog with a solid build and a short muzzle. It was introduced in the nineteenth century as a guard dog by crossing the English Mastiff with the now-extinct Old English Bulldog.
When it comes to family members, Bullmastiffs are gentle and affectionate. Their generally calm, easygoing personalities make them ideal for families with well-behaved children.
They are not friendly with strangers, and they become slightly aggressive. Also, the Bullmastiff dog breed is considered a strong and fearless family protector.
The Bullmastiff isn’t as big as his close cousin the Mastiff, but he can still stand up to 27 inches at the shoulder.
The height of the male Bullmastiff dog is about 64–69 cm (25–27 in) and for the female, the height ranges from 61–66 cm (24–26 in). The male Bullmastiff is slightly larger than the female one.
|Bullmastiff (male)||64–69 cm||25–27 in||2.09-2.26 ft|
|Bullmastiff (female)||61–66 cm||24–26 in||2-2.1 ft|
Bullmastiff dogs are gentle giants who are loyal and trusting. If we talk about their size in terms of their weight, it would vary from one Bullmastiff to the other by a small difference. However, there is a large variation between the male and the female Bullmastiff.
While the male Bullmastiffs have a weight of about 110 – 130 pounds (50 – 59 kg), the female Bullmastiffs have a weight ranging between 100 – 120 pounds (45.4 – 54.4 kg).
The male Bullmastiffs are larger than the female ones. In terms of average weight, the value is about 100 to 130 pounds.
|German Shepherd (male)||50 – 59 kilograms||110 – 130 pounds|
|German Shepherd (female)||45.4 – 54.4 kilograms||100 – 120 pounds|
Bullmastiff Puppy Size
The puppies or the young ones of the Bullmastiff differ in terms of their size with age. At a certain age, Bullmastiffs have a certain range of both height and weight. The puppies (younger ones) are smaller and lighter than the older ones.
Furthermore, these puppies grow very quickly. Males have doubled their weight by the second month, and females are close behind.
In fact, by 3 months, both males and females have nearly doubled their weight. By six months, the dogs weigh approximately seven times their birth weight.
Below is the size chart for the Bullmastiff dog from different age ranges.
|Bullmastiff Age||Male Weight||Female Weight|
|1 month||9 – 12 lbs||9 – 12 lbs|
|2 months||19 – 28 lbs||17 – 25 lbs|
|3 months||37.5 – 43 lbs||34.5 – 40 lbs|
|4 months||48 – 55 lbs||44 – 52 lbs|
|5 months||58 – 66.3 lbs||54 – 62.5 lbs|
|6 months||69.5 – 77.3 lbs||64 – 74 lbs|
|7 months||74 – 85.5 lbs||68 – 82 lbs|
|8 months||82 – 93.5 lbs||75 – 88 lbs|
|9 months||89 – 98.5 lbs||80.5 – 92 lbs|
|10 months||92.3 – 105 lbs||84 – 99 lbs|
|12 months||102 – 118 lbs||93 – 110 lbs|
|1.5 years||105 – 121 lbs||98 – 114 lbs|
|Fully grown||110 – 130 lbs||100 – 120 lb|
Large dog breeds, such as the Bullmastiff, typically take longer to mature. Each dog is unique and matures at a different rate.
Dog owners have discovered that these dogs stop growing between the ages of 18 and 20 months, with some dogs growing larger until they are two years old.
A mature adult Bullmastiff is 26 inches tall and weighs 120 pounds. Female Bullmastiffs typically stand 24-26 inches tall and weigh 99-120 pounds (45-54 kg).
Male Bullmastiffs are slightly larger, standing 25-27 inches tall and weighing 110-130 pounds on average (50-59 kg).
If You want to Check Other dogs size and comparison: Read Our Guide On All Dog Size & Comparison
Bullmastiff Litter Size
Generally, the number varies depending on several factors such as age, size, etc. The litter size of the Bullmastiff is about 5 to 13 puppies at a time. Sometimes, the litter size is also about 16, in rare cases.
Bullmastiff Size Comparison To Humans
On average an adult human weighs between 60 to 80 kg (132-176 lb) and has an overall height of about 5.2 to 5.9 feet. On the other hand, the Bullmastiff is about 50 – 59 kg (110-130 lbs) in terms of weight and 2.26 ft in terms of height.
Although they are smaller than humans they can be quite larger than children. So, their size really matters when choosing them as pets, as to whether you can handle them or not and if you have enough space to keep them.
Generally, Bullmastiff dogs are quite sweet and friendly with humans once they are trained and given love back, but they can get slightly aggressive with strangers.
Bullmastiff Vs Rottweiler Vs Boerboel Size Comparison
The maximum weight of the Boerboel reaches up to 200 pounds or 90 kg which is much heavier than the Bullmastiff or the Rottweiler.
And the Bullmastiff is slightly heavier than the Rottweiler. In terms of height, all three are almost of the same height, but in sum, Boerboels can get slightly (1 inch) larger than the others.
|Weight||154-200 pounds (70-90 kg)||Male: 110-133 pounds (50–60 kg), Female: 100-120 pounds (45-55 kg)||Male: 95-130 pounds (43-59 kg), Female: 85-115 pounds (38-52 kg)|
|Height||Male: 25-28 inches (64-70 cm), Female: 23-25.5 inches (59-65 cm)||Male: 25-27 inches (63–69 cm), Female: 24-26 inches (61–66 cm)||Male: 24-27 inches (61-69 cm), Female: 22-25 inches (56-63 cm)|
Bullmastiff Vs Cane Corso Vs Great Dane Size Comparison
In terms of their weight, the Great Dane is almost double the weight of Cane Corso and the Bullmastiff. In terms of their height, the Great Dane is longer than the other two. While the other two, Bullmastiff and Cane Corso are almost of the same height range.
|Breed||Bullmastiff||Great Dane||Cane Corso|
|Weight||Male: 110-133 pounds (50–60 kg), Female: 100-120 pounds (45-55 kg)||Male: 120-200 pounds (54-90 kg), Female: 100-130 pounds (45-59 kg)||Male: 99-110 pounds (45-50 kg), Female: 88-99 pounds (40-45 kg)|
|Height||Male: 25-27 inches (63–69 cm), Female: 24-26 inches (61–66 cm)||Male: 30-34 inches (76-86 cm), Female: 28-32 inches (71-81 cm)||Male: 24-27 inches (64-68 cm), Female: 23-25 inches (60-64 cm)|
Bullmastiff Vs French Mastiff Vs English Mastiff Size Comparison
The Mastiff is the largest dog breed. The Bullmastiff breed standard, on the other hand, calls for males to weigh 110 to 130 pounds and females to weigh 100 to 120 pounds. The English Mastiff is significantly larger and heavier than the French Mastiff or Bullmastiff.
|Size||English Mastiff||French Mastiff||Bullmastiff|
|Weight||Male: 200 pounds (90 kilograms), Female: 150 pounds (68 kilograms)||Male: 150 lb (68 kg), Female: 125 lb (57 kg)||Male: 110 to 130 pounds (50 to 59 kilograms), Female: 100 to 120 pounds (45 and 54 kilograms)|
|Height||Male: 30 inches tall (2 ft. 5 in), Female: 27 inches tall (2 ft. 2 in)||Male: 24–27 in (61–69 cm) Female: 23–26 in (58–66 cm)||Male: 25 to 27 inches, Female: 24 to 26 inches|
And that was everything you need to know about the size of a Bullmastiff. I hope this article was helpful and you got something valuable from it.
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I’m a passionate animal lover and researcher, I’ve created this website so that people can learn about the size and characteristics of different animal species. My goal is to educate and inspire people to appreciate the diversity of our planet’s wildlife.