Samoyeds are active, playful, social, and usually friendly. Along with their dense coat, these traits made them natural sled dogs and reindeer herders. However, this athleticism means they need plenty of physical and mental stimulation, including participating in dog sports such as sled or cart racing, packing, skijoring (where a dog pulls a skier), agility, flyball, and obedience as sport. Because of their social nature, Samoyeds are usefulness in animal-assisted therapy. Although Samoyeds have been described as stubborn, this can be avoided by using motivational tools such as treats and favorite toys in reward-based obedience training. Their reputation as a good family dog means Samoyeds can be around children; however, as with all dogs, extremely close supervision is needed to prevent accidental injury to the child or dog and to avoid the dog's subsequently developing fear-based defensive aggression.