The words Dog Breed Info with the letter D inside of a black paw print

Mountain Mastiff

Bernese Mountain Dog / Mastiff Mixed Breed Dogs

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 little thick bodied brindle puppy with ears that hang down to the sides, a black nose, round dark eyes, white on her chest and large front paws laying down on a tan carpet

Buddy the brindle Mountain Mastiff as a puppy—"We love Buddy. He is half English Mastiff and the other Bernese Mountain Dog, of course. He now is over 130 pounds at 11 months and loves playing with our Daschund/terrier mix girl! Quite the combination! A watch dog through and through with the mountain dog's herding tendencies! It’s quite something to be herded by your oversized pup that also uses the Mastiff weight to corner and hold. But all in gentle good fun. He’s just a big love that loves children and being with the family. He takes up some space- but it’s a good fill!"

Side view of a tan brindle puppy wearing a red collar sitting down in tall grass and weeds looking to the right

Buddy the brindle Mountain Mastiff as a puppy

Front view of a brown brindle large breed muscular dog with a white chest and ears that hang down to the sides, dark eyes and a big black nose laying down on a tan carpet

"Here's Buddy after turning one last month! He’s about 135 pounds and just a love bug."

A huge, tan-brindle, mastiff-type dog sitting on a couch next to a man with a medium-sized tricolor dog jumping up at the mans lap from the floor

Buddy at about 2 years old. He is a Big Boy now

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