In temperament it is calm and devoted to its own people and animals but distinctly wary of strangers, and it readily defends its ground. It is also independent-minded.
It is a heavily built dog, slightly longer than it is tall, with a broad skull, almond-shaped brown eyes and drop ears. The coat is dense and long, over a thick undercoat, and shorter on the head and front of the legs. It is a single solid colour, from pale shades to a brown so dark it is nearly black, with iron grey and dark grey favoured; darker shades on the back usually fade to paler tones on the legs and underside. The long tail hangs low in a sabre curve.
The Sarplaninac is a flock guardian rather than a herding dog. Its work was to stay with sheep on high summer pastures and see off wolves, bears and thieves, often with little direction from the shepherds. In the twentieth century the breed was standardised from these working dogs, and its name changed from Illyrian Shepherd Dog to Yugoslavian Shepherd Dog Sharplanina in the late nineteen-fifties. The Yugoslav army kept and bred it for guard work.