Here's a breakdown:
* Mastiffs: Mastiff breeds are known for their massive size, heavy build, and short muzzles. Examples include the English Mastiff, Bullmastiff, and Neapolitan Mastiff. Great Danes share the size aspect but have a more lean and athletic build compared to Mastiffs.
* Sighthounds: Sighthounds are characterized by their slender build, long legs, and incredible speed. They are bred to chase prey by sight, with breeds like Greyhounds, Salukis, and Whippets being examples. Great Danes are not known for their speed or agility in the same way.
Great Danes fall into the Molosser group of dogs, which are known for their strength, courage, and loyalty. They are often described as gentle giants with a calm temperament.