The Toy group is made up of those who classify as Toy because of their diminutive size and those that were bred to be companion / lap dogs of a small size. They are popular dogs because of their tendency to be friendly and the fact that they need less exercise than bigger breeds. They do, however, still need to be trained using positive reinforcement and be socialised appropriately with other dogs; a toy dog that is not treated like a normal dog can exhibit many unwanted behaviours.
They're generally intelligent and outgoing, and enjoy plenty of attention.
Some more examples of Toy dogs are listed below, and you can visit the Kennel Club's website for more information. Please also remember that every dog is an individual and both genetic and environmental factors affect their temperament.