The Koyun dog is a flock and herd guardian dog of molosser type. Koyun dogs are present in Ordu Province to the west of Rize in Turkey. This breed is also called "Bayburt Kelpi" locally.
The dog appears in various colours but dark grey is the most common. Bi-coloured animals occur. Rize Koyun dogs have a solid body structure and strong legs which make for easy traveling of the hilly areas of the Canik Mountains where they are found. The tail is normally in a downward position but is raised when the dog is alert. Shoulder heights of males are about 70 centimetres (28 in) and those of females about 1–2 cm lower.
The Rize Koyun is not a pet. In addition to guardian duties, it assists its human owners in giving vociferous or physical warning of intruding people or animals.