1) The Chihuahua: An Owners Guide to a Happy Healthy Pet (1995), by E. Ruth Terry.

2) The New Chihuahua (1990), also by E. Ruth Terry.

3) Living with a Chihuahua (2003) which comes with a dvd, by Margaret Greening.

4) Der Chihuahua (2004), the German edddition of Living with a Chihuahua by Margaret Greening.