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Border Collies are very energetic and active animals: they have no equal in endurance. Such dogs "work for the sake of work" - they need almost round-the-clock activity. Not every owner will be able to provide this to his dog: crossing with a representative of a calmer breed will only be beneficial. Borders are the smartest dogs. It sounds unexpected, but highly intelligent animals are not suitable for every owner: such pets need special training to develop quick wits, a special approach.