Black and Tan English Shepherd

First Friend Fact #55

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The bloodlines within a breed can be very important reservoirs of genetic variation, and managing these within the overall breed is important to long-term breed survival.

(Sponenberg, Beranger, and Martin 2017)
Farm Puppy Owner’s Manual
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Tony Bierman, "First Friend Fact #55," OBTESA, Accessed March 30, 2025, http://esbt.us/4o.