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Mountain Mastiff

Bernese Mountain Dog / Mastiff Hybrid Dog

Information and Pictures

A large breed, short-haired tan  with white Mountain Mastiff dog is laying on a hardwood floor on a throw rug and in front of a door.

"Brewski the Mountain Mastiff at 10 months old; about 120 pounds and very tall—he is still a little lanky and leggy, but starting to fill out and thicken up, especially in the front quarters and chest. He has an amazing temperament, great personality, loves EVERYONE and other dogs and my cats, too, but they do not particularly like him much!"

Other Names

Bernese Mountain Mastiff


The Mountain Mastiff is not a purebred dog. It is a cross between Bernese Mountain Dog and the Mastiff. The best way to determine the temperament of a mixed breed is to look up all breeds in the cross and know you can get any combination of any of the characteristics found in either breed. Not all of these designer hybrid dogs being bred are 50% purebred to 50% purebred. It is very common for breeders to breed multi-generation crosses.


ACHC = American Canine Hybrid Club

DBR = Designer Breed Registry

DDKC = Designer Dogs Kennel Club

DRA = Dog Registry of America, Inc.

IDCR = International Designer Canine Registry®

A droopy-looking, tan Mountain Mastiff puppy is walking across a hardwood floor. There is a door behind it.

Brewski the Mountain Mastiff (Bernese Mountain Dog / Mastiff mix) puppy at 3 months old

A tan Mountain Mastiff puppy is laying on a tan couch with a tan, green and maroon pillow next to it with a plush duck toy between its front paws.

Brewski the Mountain Mastiff (Bernese Mountain Dog / Mastiff mix) puppy at 5 months old on the sofa with his stuffed toy duck

Side view - A black with brown and white Mountain Mastiff is standing outside and looking to the left. Its mouth is open and its tongue is out.

Goober the Mountain Mastiff at 9 months old, weighing around 90 lbs.