Height at withers for both genders should be roughly 25 cm (9.8 in), and the length of back from withers to tail is roughly 28 cm (11 in). Generally a well-balanced Scottie dog should weigh from 8.5 to 10 kg (19 to 22 lb) and a female from 8 to 9.5 kg (18 to 21 lb). It is about 10 to 11 inches (25 to 28 cm) in height.
The Scottish Terrier typically has a hard, wiry outer coat with a soft, dense undercoat. The coat should be trimmed and blended into the furnishings to give a distinct Scottish Terrier outline. The longer coat on the beard, legs and lower body may be slightly softer than the body coat but should not be or appear fluffy.
The coat colours range from dark gray to jet black, or 'Brindle' (a mix of black and brown). Scotties with 'Wheaten' (straw to nearly white) coats sometimes occur, but should not be confused with the Soft-Coated Wheaten Terrier or West Highland White Terrier.
Scotties are territorial, alert, quick moving and feisty, perhaps even more so than other terrier breeds. The breed is known to be independent and self-assured, playful, intelligent and has been nicknamed the 'Diehard' because of its rugged nature and endless determination.The 'Diehard' nickname was originally given to it in the 19th century by George, the fourth Earl of Dumbarton.The Earl had a famous pack of Scottish Terriers, so brave that they were named “Diehards”. They were supposed to have inspired the name of his Regiment, The Royal Scots, "Dumbarton’s Diehards".
Scotties, while being described as very loving, have also been described as stubborn.They are sometimes described as an aloof breed, although it has been noted that they tend to be very loyal to their family and are known to attach themselves to one or two people.
It has been suggested that the Scottish Terrier can make a good watchdog due to its tendency to bark only when necessary and because it is typically reserved with strangers, although this is not always the case.They have been described as a fearless breed that may be aggressive around other dogs unless introduced at an early age.Scottish Terriers were originally bred to hunt and fight badgers. Therefore, the Scottie is prone to dig as well as chase small vermin, such as squirrels, rats, and mice.
Data refer : http://en.wikipedia.org/wiki/Scottish_Terrier