The English toy spaniels are different then the Cavalier king Charles spaniel. I personally have a cavalier and think they are much prettier and magestic, but that's just me. The main difference between the two breeds is that the English toy spaniels has a pug like mussle.The English toy spaniel are also known as the king Charles spaniel (not too be confused with the Cavalier king Charles spaniel).
Try Google that should help you to.
No, sadly they are not!
there are none
Cavalier King Charles Spaniels first originated in Holland, Italy and France in between the 16th and 18th centuries.
cavalier king Charles spaniels
not smart at all