Above) Chihuahuas...as Pets (1955), small 32 page "guide to the selection, care and breeding of chihuahuas" by Madeline Miller.

Below) Your Chihuahua (1966) by Ruth L. Murray, hardback in dustwrapper. The jacket notes, "Ruth Murray was given her first Chihuahua as a child, when an injury led many to believe she would never walk again. Her fascination with the breed lasted into adulthood and she bred many champions and went on to judge the breed."