Pure black, black and tan, and white are not permitted by many kennel clubs. While registration of white Cairns was once permitted, after 1917, the American Kennel Club required them to be registered as West Highland White Terriers. A notable characteristic of Cairns is that brindled Cairns frequently change colour throughout their lifetimes. Cairn Terriers are particularly easily trained; ethical breeders strongly suggest obedience school or some other type of training to direct Cairn Terriers's focus on the owner as the one in command if they are going to be used for hunting. If allowed to take control of the household, behavior problems may develop that only can be resolved by hiring a professional dog trainer. Many breeders only sell puppies to dedicated dog owners who agree to basic obedience school.
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