Bullmastiffs & Mastiffs for Adoption in Calgary

The Bullmastiff (also written "bull mastiff" or "bull-mastiff") is one of the original gentle giants — a calm, docile breed with a deep loyalty to its family that belies its imposing 100-to-130-pound frame. Bullmastiffs were originally bred in 19th-century England as estate guardians, crossed from Mastiff and Bulldog stock to silently track and pin poachers rather than attack them. That controlled, even-tempered working heritage is exactly why today's bull mastiffs make such reliable family companions: they are happiest lounging beside their people, alert but never reactive.

Mastiff-type dogs appear in Calgary rescues more often than people expect — usually because owners underestimate the space, food, and veterinary costs of a giant breed. A bull mastiff can eat 4 to 8 cups of food daily, and routine vet care costs more because of larger drug doses and extended anesthesia. The good news is their exercise needs are surprisingly modest: two moderate 20-to-30-minute walks per day is usually enough. They are not suited to apartment living due to their size, but they are notably calm and quiet indoors.

When Calgary adopters search for a "bull mastiff dog," they often actually want any of several closely related Mastiff-type breeds, all of which periodically appear in local rescues. Bullmastiffs are the original Bulldog-Mastiff cross — 100-130 lbs, short-faced, the most common variety in Calgary shelters. English Mastiffs are larger still (often 150-220 lbs) and even more docile; they show up less often but are worth waiting for. Cane Corso is an Italian Mastiff with a more athletic build, slightly higher exercise needs, and stronger guarding instincts — best for experienced owners. Mastiff mixes (often part Pit Bull, Boxer, or Great Dane) are the most common variety overall and inherit the gentle Mastiff temperament with somewhat lower food and care costs. All four types use this page; filter by size or check individual listings to confirm specifics.

All bull mastiffs and Mastiff-type dogs listed below are from 15+ Calgary-area rescues and updated regularly. Giant breeds take longer than average to find homes, so if you have the space, the budget for higher food and vet costs, and the commitment to a 7-to-10-year companion, consider giving a gentle giant a second chance.