Are boxer bulldogs mean

If the owner treats the dog aggresively or plays with the dog aggressively then the dog is more likely to become aggressive as they think its the right way to behave.

The boxer as a breed is a bright energetic playful breed and are normally good with children. They are not a vicious breed but if provoked then it will react the way it thinks it should whether its barking chasing or biting. Like all dogs, they need socialization.

Hope this helped :)