With all his many merits, the Scottie has other traits which can be
provoking. Chief of these is his stubbornness; he will hurry only
slowly and the more the owner tries to hustle him the less cooperative
he may become--he has four-wheel brakes and is quite prepared to use
them. Anger will not help for he will collapse completely, shocked
and hurt. Instant obedience and slavish subservience are not in his
nature and are a betrayal of his inheritance. He is a king, a laird,
a chief and will meet you as a friend and equal, but not as a servant
or a menial.

Betty Penn-Bull, The Kennelgarth Book of the Scottish Terrier, 1983