Shelties average 13-16 high at the shoulder when they mature. with an average weight of 20 to 25 pounds. However genetics can vary greatly. One of the pups born here matured to 35 pounds and 22 inches tall, and I can vouch for the purebred AKC genetics! We have another sheltie from an outside line that matured at 9 inches tall and 12 pounds, also AKC purebred! I don't know which family line you have but our tiny guy requires high protein puppy food and vitamin supplements to stay healthy. He is just to tiny a body to eat and process enough food and vitamins from regular adult dog food, he looses weight and condition on adult diets.
Answered by wywildfire - 3/18/2011 1:15:58 PM