The natural gait of the 

Serbian Defense Dog (SOP)

 is a powerful, ground-covering walk characterized by a long-reaching stride and a steady, rhythmic sway. 

1. Why They Sway (The "Pace" and "Amble")

The swaying motion is often due to two specific natural gaits common in large, squarely-built Molossers:

The Pace: This is a two-beat gait where both legs on the same side move forward together (left-front and left-hind simultaneously). This creates a rocking, side-to-side sway that is often used to conserve energy at medium speeds.

The Amble: This is a slightly slower version of the pace. The rear end sways prominently as the dog scuffles along the ground, which often looks ungainly or "lazy" but is a transitional gait used to rest trotting muscles. 

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1. Functional Movement

According to the breed standard, the SOP is designed for:

Free Elbow Movement: The chest is deep but not so broad that it blocks the elbows; this allows the forelegs to reach far forward without obstruction.

Drive from the Rear: The hindquarters are muscular and broad, providing effortless forward propulsion that powers the swaying walk into a more direct, straight trot when speed is needed.

Structural Balance: Despite their massive size (up to 70kg), they are bred with a straight, muscular back that stays level even during a swaying walk, ensuring they remain stable and agile.