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Size: Giant

Weight: 175 - 190 lbs.

Height: 27" - 30"

Life Span: 9 - 11 years

Health Problems: Bloat; hip dysplasia; elbow dysplasia; progressive retinal atrophy (eye disorder that leads to blindness); persistent pupillary membranes (failure of PPMs to disappear at birth which causes eye problems); ectropion (outward protrusion of the eyelid); vaginal hyperplasia (swollen vagina that may protrude from the vulva in intact females); heart disease

Origin: Great Britain (Ancient Times)

Also Known As: English Mastiff, Old English Mastiff

Group: Herding / Guardian

Category: Companion Dog, Guard Dog

Exercise Needs

No special exercise requirements.

Grooming Needs

No special grooming requirements.


The Mastiff is good-natured, self confident and gentle. Once a fierce guard dog, over time breeders have been able to adapt the Mastiff to family life. This breed is extremely intelligent and responds well to patient, consistent training. Guard training isn't necessary because the Mastiff is naturally protective and will know what to do in the case of an intruder or disturbance. The Mastiff rarely barks. When it does bark, you know its trying to tell you something. The Mastiff does not interact well with other pets, but can get used to other dogs if raised with them from a young age.

Compatibility with Kids

Good with kids but, due to its large size, should be supervised with toddlers and smaller children to avoid accidental injury.


It is believed that the Mastiff originated in Asia and was brought to the Mediterranean and the rest of Europe via ancient Phoenician traders. In Great Britain, breeders perfected the dog and began exporting it as a military and fighting dog around 2,000 years ago. Today the Mastiff is a good mix of a gentle companion and a protective guard dog.

Dog Food for Your Mastiff

Large Breed Puppy 15 lb. Front Counter

Large Breed Puppy

Lower protein and fat levels than our Puppy Select Formula.

Large Breed Adult 15 lb. Front Counter

Large Breed Adult

Carefully formulated for the care and nutrition of large breed dogs.

Reduced Fat 6 lb. Front Counter

Reduced Fat Formula

30% less fat than Bil-Jac Adult Select.

Sensitive Solutions Skin & Stomach Support 6 lb. Front Counter

Sensitive Solutions Skin & Stomach Support

Features the SmartDefense™ System, with vitamins C & E.