Shelties are vocal dogs. They can be fearful of loud noises and new situations. Some say that males make better and more affectionate pets, but it more likely depends upon each individual dog's and their owner's personalities as well as patience and consistent training and conditioning. If pestered or teased, some Shelties may respond by biting. This again, depends on each individual dog's temperment. The herding instinct is still very strong in many Shelties. They love to chase things. They do best with a sensitive, yet firm owner. The Sheltie is, above all, an intelligent herder and likes to be kept busy, although their activity level usually coincides with their owner's level.