Ours are both around 43lbs. One we think has some springer spaniel mixed in and the other is part cattle dog. I'm really not sure where they get their size. My wife's uncle has a full blood BC with papers and she's only about 35 lbs and some other friends have a BC who I think is registered I'm pretty sure is smaller than Tessa. Evidently BCs are all over the place in size.
From what I understand, border collies are kind of glorified mutts. It’s a big part of why they can look so different and typically have fewer problems that other pure breed dogs have.
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