The Cavalier King Charles Spaniel is a small breed of dog of Spaniel type, usually considered one of the toy dog breeds. It is a small spaniel with a substantial silky coat of moderate length, often with a mild wave, and long ears. Four colors (Blenheim, Tricolor, Black and Tan, and Ruby) are recognized. The breed originated in the 20th century, though has its roots in the older King Charles Spaniel of the Restoration.(Wikipedia)
The Cavalier is quite intelligent and easy to train. For example they seem to be able to learn (and remember) tricks (lay down, roll over, shake, etc.) within a day or two. They can be easily trained to do other things with a good treat.(Wikipedia)
The breed is highly affectionate, and some have called the Cavalier King Charles Spaniel "the ultimate lap dog" or the "love sponge" of dogs. Most dogs of the breed are playful, extremely patient and eager to please.(Wikipedia)
Cavaliers can suffer from a number of severe genetic defects. Unfortunately, two possible genetic conditions, mitral valve disease and syringomyelia, can be both severe and very common.(Wikipedia)