Here's why:
* Height: Great Danes are known for their towering stature, with males typically reaching 30-32 inches tall at the shoulder and females 28-30 inches. Bullmastiffs, while large, are a bit shorter, with males around 27-30 inches and females 25-27 inches.
* Weight: While both breeds are heavy, Great Danes can also be significantly heavier, with males weighing 110-175 pounds and females 100-150 pounds. Bullmastiffs are heavier than most breeds but usually weigh between 110-130 pounds for males and 100-120 pounds for females.
Of course, there are always individual variations within any breed, and some Bullmastiffs might be taller than some Great Danes. However, on average, the Great Dane is the taller breed.