 The breed remains very popular in the UK , twice winner at Cruft 's , and is in the top third of all breeds in the US since the 1960s . It has been featured in television and film , including in Hamish Macbeth and in advertising by companies such as Cesar dog food and Scottish whisky Black & White . It is a medium @-@ sized terrier , although with longer legs than other Scottish breeds of terrier . It has a white double coat of fur which fills out the dog 's face , giving it a rounded appearance . The breed can be good with children , but does not always tolerate rough handling . The Westie is an active and intelligent breed , and is social with a high prey drive , as they were once used to hunt rodents . 
