RedMerle Border Collie Size. Red Merle Border Collies get to a height of 18 to 22 inches (45.7cm to 55.9cm) tall and weigh between 30 and 55 pounds (13.6kg to 24.9kg) when fully grown.Blackand White Border Collies are not rare at all. In fact, black and white is the most common color combination for Border Collies. Blue Merle Border Collie. Blue Merle Border Collies feature patches of black, grey, white and tan in a distinct mottled pattern as they carry the merle gene. Their body, tail, ears and sides of their face
White White is the rarest color in the Collie breed. It occurs in combination with Sable, Sable Merle, Tri-Color, and Blue Merle colors, but it is recognized as its own color. The White Collie will have a normally marked head, but most of the body will be white. Body spots may occur.
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