It has black erect ears and a black muzzle. Some may be excessively exuberant or playful, especially when young.They can be destructive or develop neurotic behaviours if not provided enough stimulation and exercise. This often causes problems for owners who are unfamiliar with the breed and are not prepared to provide the exercise they require or a job for them to do. They are medium-sized, strong dogs that require consistent obedience training, and enjoy being challenged with new tasks. They are known to be very easy to train, due to their high drive for rewards.