Here are some dog breeding books that may be worth a look, to find more info or purchase, click the picture for the us site and the link below for the uk amazon site
The Book of the Bitch: A Complete Guide to Understanding and Caring for Bitches


The Complete Book of Dog Breeding
by Dan Rice, Barrons Educational Series "The goal of this book is to provide practical, usable information..." (more)

http://www.amazon.co.uk/exec/obidos/ASIN/0812096045/chihuahuapeop-21
The Book of the Bitch: A Complete Guide to Understanding and Caring for Bitches

http://www.amazon.co.uk/exec/obidos/ASIN/1860540236/chihuahuapeop-21Book of the Bitch is essential reading for anyone considering owning a female dog. This book was published in the UK, and is distributed in North America by Willow Creek Press.

http://www.amazon.co.uk/exec/obidos/ASIN/0764508725/chihuahuapeop-21Breeding puppies involves many responsibilities, but it can also be one of the most enjoyable and rewarding experiences you ever have. This friendly guide provides all the information you need to create a positive breeding environment for your dogs so that they produce happy, healthy offspring.
The Complete Book of Dog Breeding
by Dan Rice, Barrons Educational Series "The goal of this book is to provide practical, usable information..." (more)

http://www.amazon.co.uk/exec/obidos/ASIN/0812096045/chihuahuapeop-21