The Cairn Terrier is a small-sized breed of dog that originated in Scotland. They were originally bred for hunting small game and rodents, and are known for their shaggy and wiry coat, their compact and sturdy build, and their lively and energetic nature.

Cairn Terriers are known to be lively, energetic and affectionate breeds. They have a moderate energy level and require regular exercise and mental stimulation to prevent boredom and destructive behavior. They are known to be sociable and enjoy the company of other dogs and people. They are also known for their intelligence and trainability, and excel in obedience and agility training. They are also known to be good with children and can be taught tricks and games.

Cairn Terriers require consistent, firm and positive training starting at an early age. They should be trained in basic obedience and socialization to prevent them from becoming aggressive or overly dominant. They are also known to be very vocal and can be trained to bark only when necessary.

Cairn Terriers have a double coat (longer topcoat and a short undercoat) that requires regular grooming to maintain its condition. They shed moderately throughout the year, and require regular brushing to remove loose hair.

Overall, the Cairn Terrier makes a great companion for experienced dog owners who have the time and energy to provide them with regular exercise and training. They are lively, energetic, and affectionate, and make great watchdogs. They are not recommended for first-time dog owners or people who live in an apartment or have a small backyard. They need a lot of space to run and play, and are not recommended for city dwellers. They are also not well suited for homes with small animals or children. They have a lot of energy and need to be kept busy with activities and tasks. They also require a strong leader who can provide them with the proper training and socialization to prevent them from becoming aggressive. They excel in obedience and agility training.