What feature acts like a spring in the Whippet's short, strong loin?
Answer
The decided arch
The short, strong loin of the Whippet is characterized by a decided arch, which is fundamentally important to its athletic performance. This anatomical feature functions akin to a spring mechanism within the dog’s frame. During movement, especially the famous double suspension gallop, this arch allows the dog to coil and then extend its rear legs far underneath its body, generating maximum propulsion and reach. This coiling and extending action is what enables the breed to cover ground rapidly and efficiently. While other structural elements like the deep chest and lean waist are vital, the arch in the loin is explicitly identified as the 'engine' driving the powerful extension required for top speed.

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