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

American Mastiff Pictures

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The right side of a brindle American Mastiff that is standing across a field outside. Its mouth is open and its large tongue is out.

Thor the brindle American Mastiff at 3 years old, weighing 160 pounds

Other Names

AM Mastiff

North American Mastiff

A brindle American Mastiff puppy is standing on a dirt patch, it is wearing a leash and it is looking to the right.

Thor the American Mastiff puppy at 8 weeks weighing in at 18 pounds

Close up - A brindle American Mastiff puppy is peering over the shoulder of a person that is holding it. There is a stone wall behind it.

Thor at 8 weeks weighing in at 18 pounds

A brindle American Mastiff puppy is laying on a rug, its mouth is open and it looks like it is smiling. Behind it is a computer desk.

Thor at 11 weeks weighing in at 30 pounds

The right side of a brindle American Mastiff puppy that is sleeping on a rug.

Thor at 11 weeks weighing in at 30 pounds

A brindle with white American Mastiff puppy is sitting on a rug, next to a desk chair.

Thor at 4 months weighing in at 43 pounds

The right side of a brindle American Mastiff puppy that is sitting on a couch with a penguin plush toy in front of it.

Thor at 4 months weighing in at 43 pounds

Close Up - The front right side of a brindle American Mastiff puppy that is sitting on a couch and it is biting a Penguin plush toy in front of it.

Thor at 4 months weighing in at 43 pounds

A brindle American Mastiff puppy is sitting in a desk chair. There is a computer behind it and it is looking forward.

Thor at 5 months weighing in at about 80 pounds

The front right side of a brindle American Mastiff puppy that is laying across a couch

Thor at 6 ½ months old weighing in at about 100 pounds

The left side of a brindle American Mastiff that is standing next to a barn and there is a golf cart behind it.

Thor at 7 months old

The right side of a brindle American Mastiff that is standing outside in front of a fence. The Mastiff is reaching to the right.

Thor at 7 months old

Close up - The right side of a brindle American Mastiff that is sitting on a grass with its mouth open and its tongue out. There is a person standing behind it

Thor at 7 months old

Close Up - A brindle American Mastiff is laying down on a stone porch. There are people standing around it.

Thor at 7 months old

A brindle American Mastiff is laying on hardwood floor, its mouth is open, its tongue is out and it is looking up.

Thor the American Mastiff at 11 ½ months and about 135 pounds

The right side of a brindle American Mastiff that is sitting in a kitchen.

"Thor the American Mastiff at 16 months and about 165 pounds—Thor is sitting in the kitchen being good, waiting for a bone :) His head is about level with the stove when he is sitting like now, but when he stands, he can swipe things off the counter top/stove. He looks kind of fat in this pic. Like the rolls by his back hip, but he just seems to have a lot of skin he hasn’t finished growing into yet. He will continue growing until he is about 3 years old, although it’s definitely slowed down a bit."

The left side of a brindle American Mastiff that is standing on a blacktop with its mouth open and tongue out. There is a person standing behind the Mastiff holding its leash.

Thor the American Mastiff at 3 years old, weighing 160 pounds

The front right side of a brindle American Mastiff that is standing on grass with its mouth open and its large tongue its hanging out to the side of its mouth.

Thor the American Mastiff at 3 years old, weighing 160 pounds