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: The period between 6 and 18 months is officially recognized by experts as the "teenage phase" for Border Collies, characterized by high energy and temporary "forgetfulness" of training.

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: You may also find discussions regarding 18-week-old puppies and the specific training needs required for working breeds at that age. : The period between 6 and 18 months

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: Famous historical collies like Wiston Cap (who sired 187 litters) are often the focus of breed-specific research papers and historical genealogies.