Though sometimes stubborn and strong willed, border terriers are, on the whole very even tempered, and are friendly and rarely aggressive. They are very good with children, but may chase cats and any other small pets.
border terrier puppies do well in task-oriented activities and have a surprising ability to jump high and run fast given the size of their legs. The breed has excelled in agility training, but they are quicker to learn jumps and see-saws than weaving poles. They take training for tasks very well, and are extremely trainable, and capable of learning tricks quickly and competently. The border in recent years has been bred to harbor a more subtle character so are more adaptable to apartment living if properly exercised.
They are intelligent and eager to please, but they retain the capacity for independent thinking and initiative that were bred into them for working rats and fox underground. Their love of people and even temperament make them fine therapy dogs, especially for children and the elderly, and they are occasionally used to aid the blind or deaf. From a young age they should be trained on command.
border terriers can adapt to different environments and situations well, and are able to deal with temporary change well. They will get along well with cats that they have been raised with, but may chase other cats and small animals such as mice, birds, rabbits, squirrels, rats, and guinea pigs.
border terrier puppies love to sit and watch what is going on. Walks with Borders will often involve them sitting and lying in the grass to observe the environment around them.