What specific feature separates the Peruvian from breeds like the Sheltie or Coronet?
Answer
The forward-growing hair on the crown/head.
While Shelties and Coronets also have long hair, the Peruvian is distinguished by the way the hair on the head grows forward and the presence of a distinct swirl or rosette on the crown from which the hair radiates.

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3 Peruvian models Peruvian, Alpaca/Boucle & Lunkarya Guinea pig
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