Is a bullmastiff dog aggressive?

Most Bullmastiffs are good with children if they are brought up with children and common sense is used. Never forget that while not an aggressive dog, the Bullmastiff is a guard dog protective of those it is guarding, particularly if they are children. If it fears your child is in danger it will react. read more

I’ve only seen about 20 in my career but they did range the behavior spectrum from sweet and cuddly to grumpy and aloof. None were overtly aggressive to humans but one female considered smaller dogs tasty treats. read more

Because if its size, a mastiff is capable of causing considerable harm should its prey drive or territorial instinct get triggered. Any dog can become aggressive in certain contexts, so it's wise to be cautious with a large dog. Even a small dog can take off a finger, but a bull mastiff can cause more damage. read more