Instructions
Look at the size of the dog. The most glaring physical difference between a mastiff and bulldog is their size. An adult female and male mastiff is typically between 140 to 160 pounds. Males are 31 to 34 inches tall and females are 27 to 29 inches tall. Conversely, the female bulldog generally weighs in at 40 to 45 pounds and the male weights 50 to 60 pounds.
Look at the ears. A mastiff's ears are V-shaped, while a bulldog's ears are rose shaped.
Examine the tail of the dog. A bulldog's tail is low set and small, while a mastiff's tail is high set and significantly longer.
Look at the dog's face. Although the mastiff and bulldog have similar facial features, the bulldog's jowls are larger and more pronounced with a turned-up jaw, while a mastiff has slightly smaller jowls and a lower hanging jaw.
Examine the dog's legs. A bulldog's legs are mostly bowed, with small, straight forelegs. A mastiff's legs are longer and straighter.
How to Tell the Difference Between a Mastiff & a Bulldog
The English bulldog is famous for its grumpy appearance and wrinkly skin, while an English mastiff stands as one of the largest dog breeds. The English Mastiff and English Bulldog share similar characteristics, such as color, a stocky appearance and facial features, but the two dogs have a lot of differences as well. A Mastiff is noticeably larger, and stands higher, whereas a bulldog is short and is closer to the ground.