Working Group
Bullmastiff
Champion Pedigree
Steadfast
Gentle
Guardian
Bred in 19th-century England by gamekeepers to silently track and pin poachers on large estates, the Bullmastiff combines Mastiff bulk with Bulldog tenacity. Despite its imposing size and guarding history, it is famously calm and devoted at home.
Lifespan
8–10 years.
Did You Know?
Gamekeepers originally bred the Bullmastiff specifically to catch and hold a poacher without mauling him — a "silent tracker" prized for restraint as much as strength.
Breed Traits
Size
Males 25–27 in. tall, 110–130 lbs; females 24–26 in. tall, 100–120 lbs.
Energy Level
Low to moderate — short to moderate walks suit it well.
Coat & Grooming
Short, dense coat; low grooming needs, moderate shedder.
Good With Families
Calm and gentle with family, generally patient with children given its steady temperament.
Registry Record
Also Known As
Gamekeeper’s Night Dog
Origin
England, developed by gamekeepers in the 1860s.
Typical Litter Size
6 to 10 puppies.
Club Recognitions
AKC, FCI, KC (UK), CKC
Disposition
Calm, confident, and protective; naturally wary of strangers, requiring early socialization given its size and guarding instincts.
Coat Colors
Fawn, red, and brindle, always with a black mask.
Working Roles
Historically a gamekeeper’s guard dog for tracking and restraining poachers; today primarily a companion and family guardian.
Health & Wellness
Its giant size brings elevated risks of hip dysplasia, bloat, and certain cancers — significant considerations for prospective owners.
Notable Bullmastiffs
Gamekeeper Heritage
Bred specifically for English estate gamekeepers to deter and restrain poachers.
Registry Champions
A commanding presence in the working group at conformation shows.
"The Silent Tracker"
A historic nickname reflecting its original job of quietly pursuing intruders.
Related Reading
Bullmastiff Gifts
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