What goes into an Old-fashioned Black and Tan English Shepherd?

Why is it difficult for a retired urban professional in Portland to consistently breed dogs that are true to the ancestors bred by farmers of the southern Great Valley region? Because social influences, selection pressures and gene/environment interactions form the foundation of what makes an Old-fashioned Black and Tan English Shepherd what it is.

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Tony Bierman, "What goes into an Old-fashioned Black and Tan English Shepherd?," OBTESA, Accessed December 13, 2024, http://esbt.us/3o.