File:Blue merle Border Collie.jpg - Wikimedia Commons

Blue Merle Border Collie High-Res Stock Photo - Getty Images

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Border Collie Runs With its Tongue Out in the Field in Czech Republic. Black and White Dog is Happy about its Freedom in Czechia. Nature Stock Photos

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File:Blue Merle Collie.jpg - Wikimedia Commons

Irish Sheepdogs – Why I Love Border Collies