Bullmastiff
Combine the fact that bullmastiffs aren’t very aware of their large size, and that they’re more aggressive than other breeds, it makes sense why parents with young kids are worried. But, like all dogs, with proper training, this breed can be your family’s best friend. They show a heightened loyalty to their owners, often viewing them as leader of the pack, so make sure to avoid showing signs of weakness around your bullmastiff.
Saint Bernard
The 90’s film Beethoven is responsible for making the Saint Bernard breed infamous. Although they can be trained, their playful nature makes it all the more difficult. Saint Bernards are very sweet with children, but their enormous size makes it almost impossible for them not to knock over everything and anyone in their path. They are great family dogs, but their stature makes them very difficult for people with young kids.