Big or small, training is an important part of owning a dog. However, some breeds, especially the larger ones, may have a bit of a stubborn streak — such as the bullmastiff. Bullmastiffs are big dogs, ...

Stacker highlights the 50 biggest dog breeds, according to the American Kennel Club, from the Irish setter to the mastiff.

These obedient giants can weigh up to 16 stone. They’re characterised by their short coats, and large heads and feet. Despite being generally docile animals, they’re fierce protectors of their ...