The Chihuahua (1951) by Thelma Gray was one of the earliest books to be devoted to the breed. The chihuahua (left, above) is Gray's champion Rozavel, to whom many chihuahuas in England and Australia today trace their lineage.

Shown below is Gray's later volume The Popular Chihuahua (1961) expanding and updating her classic overview. By this time she had a quarter-century expertise in the breed. Shhhe judged the very first all-chihuahua show held in England, in 1958.