In the late 1600s, the King Charles Spaniels were interbred withPugs, which resulted in a smaller dog with flatter noses, upturned faces, rounded heads and protruding eyes.
The consequence of this breeding is what we know today as King Charles Spaniel (English Toy Spaniel). It was developed in the British Isles and was a favorite of British Royalty. The breed was recognized by the AKC in 1886.