Rottweiler, also known affectionately as "Rotties," is one of the most popular dogs in the United States. They are well known to be powerful, protective, loyal, and famous for their instinct for guarding.  But Rottweilers are also easily trained, making them loyal, loving, and confident guardians.

Rottweilers were originally "Drovers."

As the Roman Empire was expanding, It needed a way of feeding massive traveling armies of men. They used their dogs to herd livestock and march them along with the army.

This was the only viable way for the soldiers to have a steady food supply without refrigeration. Today, the Rottweiler participants in herding events, and can keep up with the sheepdogs and shepherds in the field.

Source:

https://www.akc.org/expert-advice/lifestyle/fun-facts-rottweiler/

Height:

Male Rottweilers can be anywhere from 24 to 27 inches in height at the shoulders or withers, while females are slightly smaller between 22 to 25 inches at the shoulders or withers.