*The ‘Blackie’, as it’s often called, can also be sub-divided into 3 types, which differ slightly in size and appearance – the types are known as Perth, Lanark and Northumberland. | *The ‘Blackie’, as it’s often called, can also be sub-divided into 3 types, which differ slightly in size and appearance – the types are known as Perth, Lanark and Northumberland. |