30 Years of Loving Gentle Giants: A Retrospective on Raising Bullmastiffs

For thirty years, Bullmastiffs were the heartbeat of our farm in Monett, Missouri. I held their tiny, wrinkled newborns in my hands and, not so many months later, watched those same pups grow into dignified, 120-pound guardians who followed me from room to room. I will always love this breed with all my heart, and that is exactly why I want to share what three decades taught me.

I no longer breed Bullmastiffs. The honest reason is size: a Bullmastiff mother can weigh well over a hundred pounds, and caring for giant dogs through whelping, illness, and old age takes physical strength I decided I could not promise to give at the level these dogs deserve. Retiring from the breed was one of the harder decisions of my life. But my love for the breed, and what I learned from it, has not retired. This guide is my way of passing it on to anyone who owns, loves, or is considering a Bullmastiff.

Where the Bullmastiff Came From

The Bullmastiff was developed in nineteenth-century England by gamekeepers who needed a dog to deal with poachers on large estates. The goal was a dog large and strong enough to pin a man, yet calm enough to hold him without mauling him. Breeders crossed the Mastiff and the Bulldog, roughly 60 percent to 40 percent, and the result was the "Gamekeeper's Night Dog." The history of the Bullmastiff is well documented, and the American Kennel Club recognized the breed in 1934.

That purpose still shapes the dog. A good Bullmastiff is watchful and quiet, rarely barks without reason, and prefers to stand its ground rather than chase. It is a guardian by nature, not by training.

Temperament: The Gentle Giant, Described Honestly

The Good

• Devoted to family. Bullmastiffs bond deeply and want to be near their people.
• Calm indoors. Adults are famously laid back, content to lie at your feet for hours.
• Quiet watchdogs. They notice everything and bark rarely.
• Affectionate with children in their own family. With proper introductions they are patient, though their sheer size demands supervision around toddlers.

The Challenging

• Stubborn streak. They are intelligent but independent. Training must be patient and fair.
• Dog selectivity. Many adult Bullmastiffs do not enjoy rough, boisterous dog parks, and some become intolerant of other dogs, especially of the same sex, as they mature.
• Drool, snoring, and gas. These are not occasional. They are daily realities.
• Strength. A 120-pound dog that pulls on the leash is a safety issue, so leash manners must be taught early.

Protection Instinct vs. Protection Training

People often ask whether to train a Bullmastiff to guard. My answer after thirty years is almost always no. The breed already has a protective instinct, and the better gift you can give it is confidence and calm, built through socialization, so it can tell a friend from a threat. A poorly socialized giant dog is a liability, not a guardian.

Size, Growth, and Lifespan

According to the breed standard, adult males are typically around 110 to 133 pounds and females around 100 to 120 pounds, standing roughly 24 to 27 inches at the shoulder. Individual dogs often exceed those numbers.

The hard truth is lifespan. The AKC lists roughly 7 to 9 years for the breed. Large, heavy dogs age faster, and Bullmastiffs are prone to cancers and heart problems that can shorten life. Knowing this does not make the years less precious. It makes you plan better, keep the dog lean, and cherish every season.

Growth in Phases

• Birth to 8 weeks: Nursing, early handling, first socialization.
• 2 to 6 months: A staggering growth rate. A Bullmastiff puppy can add several pounds a week.
• 6 to 18 months: The "gangly" stage. The skeleton is still maturing, and the joints are vulnerable.
• 18 to 36 months: Filling out, with muscle and chest developing into the final adult frame.

Bullmastiff Health: What Every Owner Must Know

Bloat (Gastric Dilatation-Volvulus)

Bloat is the emergency I fear most. In gastric dilatation-volvulus, the stomach fills with gas and can twist, cutting off its own blood supply. Deep-chested giant breeds are at greatest risk. It can kill within hours. The American College of Veterinary Surgeons describes the signs and the need for emergency surgery. Our full prevention protocol is in the companion article on preventing bloat and protecting joints.

Hip and Elbow Dysplasia

These inherited joint conditions cause arthritis and pain. Responsible breeders X-ray their breeding dogs and submit results to the Orthopedic Foundation for Animals. Weight control, sensible exercise, and careful growth management reduce the severity in dogs that carry the risk.

Heart Disease

Subaortic stenosis and cardiomyopathies appear in the breed. Ask for a heart evaluation by a veterinary cardiologist on any breeding dog.

Cancer

Lymphoma, mast cell tumors, and other cancers are among the leading causes of death in Bullmastiffs. Check your dog's skin and body regularly for new lumps, and have any growth examined promptly.

Eyes, Skin, and Heat

Entropion and ectropion (eyelid problems) occur, as do skin fold infections. Like all short-muzzled dogs, Bullmastiffs can struggle in heat, so keep them cool, shaded, and hydrated.

Health Testing to Request

• Hip and elbow evaluations.
• Cardiac evaluation.
• Eye examination.
• Relevant genetic panels recommended by the breed's parent club.

The First 18 Months: Protecting a Growing Giant

This is the section I would hand to every new Bullmastiff owner first. What you do during the first year and a half can shape your dog's joints for life.

Keep Them Lean

A chubby giant-breed puppy grows too fast, and rapid growth stresses developing joints. You should be able to feel the ribs easily and see a visible waist from above. Feed a diet formulated for large-breed puppies and measure it.

Limit High-Impact Activity

• No jumping out of trucks or off tall furniture.
• No long runs, forced jogging, or repetitive fetch on hard ground.
• Be careful with slippery floors and steep stairs.
• Short, frequent play and walks beat marathon sessions.

Provide Good Footing and Bedding

Thick, supportive bedding protects elbows from pressure sores (hygromas), and traction on indoor floors helps young dogs avoid injuries.

Socialization and Training

The Window That Matters Most

From about eight to sixteen weeks, a puppy's brain is open to new experiences. Introduce your puppy to a wide range of friendly people, children, sounds, surfaces, and calm, vaccinated dogs. Keep every experience positive and gentle. A giant dog that is comfortable in the world is a safe dog.

Training Principles That Work

• Start early. A 20-pound puppy that jumps is cute; a 120-pound adult that jumps is dangerous.
• Use positive reinforcement. Bullmastiffs are sensitive and shut down under harsh correction.
• Teach loose-leash walking from day one.
• Keep sessions short. They bore easily and may simply decide to stop.
• Be consistent. Every family member must follow the same rules.

Daily Care: Feeding, Exercise, and Living Space

Feeding

Divide the daily ration into two or three smaller meals, and consider a slow feeder. Feed a quality diet appropriate for age and weight, and ask your veterinarian for guidance on portions. Keep treats modest.

Exercise

Adults need daily walks and some play, but not extreme exercise. Moderate, regular activity keeps muscle strong and weight in check. Avoid vigorous exercise right before and after meals.

Living Space

Bullmastiffs are indoor family dogs. They need a secure yard, shade, and cool surfaces, and they do not do well isolated outdoors or in kennels. They are not good candidates for hot climates without air conditioning.

Grooming

The short coat is easy to maintain with weekly brushing. Clean facial folds, check ears, trim nails, and keep up with dental care.

Is a Bullmastiff Right for You?

Bullmastiffs are wonderful for people who:

• Have the space and budget for a giant dog (food, vet bills, medications, and emergency care are large).
• Are home often and want an indoor companion.
• Can handle strength, drool, and shedding.
• Are committed to training and lifelong socialization.

They are a poor fit for anyone who wants a dog-park social butterfly, a hot-climate outdoor dog, or a dog with a long lifespan. If you are unsure, talk with owners and the breed's parent club, and read the AKC Bullmastiff overview before you commit.

Frequently Asked Questions About Bullmastiffs

Are Bullmastiffs good with children?

Generally yes, within their own family, when properly socialized and supervised. Their size means even gentle play can knock a small child over, so always supervise.

Are Bullmastiffs aggressive?

The breed is protective but should not be aggressive. Temperament problems usually come from poor breeding or poor socialization.

How much does a Bullmastiff eat?

Adults commonly eat several cups of food a day, depending on the food and the dog. Weight management matters more than any chart, so adjust to keep your dog lean.

How long do Bullmastiffs live?

Typically 7 to 9 years. Lean body weight, good veterinary care, and attention to bloat and joint health give your dog the best chance.

Do Bullmastiffs drool?

Yes, often a lot, especially after eating, drinking, or when excited. Keep a towel handy.

Final Thoughts from Donna

Thirty years is a long time to love a breed. I have been kept awake by whelping mothers, laughed at wrinkled puppies who tripped over their own feet, and said goodbye to old friends far sooner than I wanted. I would do all of it again. If you are lucky enough to share your life with a Bullmastiff, give it your patience, keep it lean, learn the signs of bloat, and never stop being its safe place.

If you have questions about living with a giant breed, please ask Donna directly, and read our essential companion article on preventing bloat and protecting giant-breed joints.