Cowboy, a five-year-old red-tri Australian Shepherd, demonstrates the Aussie "smile."

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Cowboy, a five-year-old red-tri Australian Shepherd, demonstrates the Aussie "smile." The curled lip is known as flehmen, by which dogs use their Jacobson's Organ inside their mouth to smell pheromones and other barely detectable scents. (Photo by Carmen K. Sisson/Cloudybright)

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Size: 4928px × 3264px
Location: Coden, Alabama, USA
Photo credit: © Carmen K. Sisson/Cloudybright / Alamy / Afripics
License: Licensed
Model Released: No

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