Height at the withers: Males 45 - 50 cm, Females 42 - 47 cm. Average weight: Males 18 - 20 kg, Females 16 - 18 kg. The Polish Lowland Sheepdog is a compact, strong, medium size dog and one that always has an alert, lively look about them. They are in fact, a lot more robust than their body size might first suggest.