The Cesky (chess-key) Terrier, also known as the Bohemian or Czech terrier, was developed by Czech geneticist Frantisek Horak.
The Scottish and Sealyham terriers were used to develop a breed of terrier that would work well in the open field as go to ground. This terrier was developed with a narrower chest and smaller head than the Scottish and Sealyham terrier to avoid getting stuck down a hole while chasing vermin and small animals. Temperament was also something Mr. Horak was interested in improving for a small working terrier. He succeeded in developing the Cesky after his initial breeding in 1949, of a Sealyham male to a Scottie bitch, and received official recognition by the FCI in 1963.
The FCI standard dictates that this breed should be 27 to 35 cm (10.5 to 13.5 in.) at the withers and weigh between 6 & 9 kg. (13 to 20 lbs.)