What is the average size of a Shetland Sheepdog?

Both male and female Shetland Sheepdogs have a height of 13 - 16 inches tall (at the withers) and weigh 20 lbs on average.
Both male and female Shetland Sheepdogs have a height of 13 - 16 inches tall (at the withers) and weigh 20 lbs on average.