Onyx

Available

3-7 years|Bullmastiff, Mixed Breed|Male|Large|Philadelphia, PA

Onyx

Available

3-7 years|Bullmastiff, Mixed Breed|Male|Large|Philadelphia, PA

About Onyx

About Bullmastiff Dogs

Bullmastiffs are large, powerful guardian dogs that combine the strength of the Mastiff with the alertness of the Bulldog. They were originally bred by English gamekeepers to guard estates against poachers. Despite their imposing size, they are gentle, calm, and devoted family companions.

Adopting a Bullmastiff means welcoming a loyal guardian who is naturally protective without being aggressive. They are patient with children, quiet in the house, and surprisingly low-energy for their size, preferring calm companionship over vigorous activity.

Temperament

LoyalBraveAffectionateCalm

Size

Giant (100-130 lbs)

Exercise

Low

Good With

Kids, Seniors

Lifespan

7-9 years

Health notes: Prone to hip dysplasia, bloat, cancer, and heart conditions. Their shorter lifespan is typical for giant breeds. Maintaining a healthy weight is critical.

See all Bullmastiff in Philadelphia, PA Browse all Bullmastiff dogs

Adopting in Philadelphia, PA

Philadelphia has a strong culture of pet adoption, with dedicated rescue organizations and city shelters working to find homes for animals in need. The city's historic neighborhoods and beautiful parks provide a wonderful backdrop for life with a pet.

From Fairmount Park - one of the largest urban parks in the country - to the Schuylkill River Trail, Philly offers plenty of space for you and your adopted pet to explore together. Join the City of Brotherly Love in showing compassion to shelter animals.

Local Climate & Pet Care

Winter

25°F to 40°F

Dec – Feb

Philly winters bring cold temperatures, snow, and icy sidewalks treated with salt. Protect your pet’s paws with booties or wax, and wipe them down after walks. Fairmount Park and the Schuylkill River Trail are still accessible but can be slippery after storms.

Spring

40°F to 68°F

Mar – May

Spring cherry blossoms along the Schuylkill River make for beautiful walks with your pet. Temperatures gradually warm through the season, and parks come alive with activity. Watch for seasonal allergies in pets as pollen levels rise in April and May.

Summer

68°F to 88°F

Jun – Aug

Hot, humid summers in Philly call for shade and hydration on walks through the city. Avoid midday pavement and stick to shaded trails in Wissahickon Valley Park. Carry water for your pet and take breaks in the shade during longer outings.

Fall

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Onyx

Onyx

About Onyx

Adoption Fee

Rescues & Shelters