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, ...

It's a cliché to refer to dogs as "man's best friend," but the four-legged furballs have earned the distinction. According to archeologists, dogs were the first domesticated animal, with some ...