6. Cavalier King Charles Spaniel

This breed is increasing popular, no doubt due to it's adorable face. They are classified as a toy breed, weighing up to 18 pounds. They are indoor dogs, with minimum exercise needs and maximum attention needs. They want to spend time with their human, and do not do well if left alone for long periods. This is an ideal dog for someone who is retired or works from home. In general, they are affectionate, loveable, and playful. For more details on this breed, read about them on Vetstreet.com.