#13 He never shows unreasonable aggression. He can make friends with people close to his family, enjoys the arrival of guests, and peacefully watches strangers on the street.

#14 But if a stranger enters the territory of the terrier without asking, the dog will immediately notify the owner of the uninvited guests with a loud bark.

#15 The Border Terrier, with its indefatigable character and tremendous energy, requires an appropriate approach to training.
