makes sense really to go to a breeder that shows, or as you say, how do you know what your getting.
I have been told there are other toy dog owners at show class tomorrow, not sure if chi owners will be there.
The kennel club has information on breeds, and I have also just found a website with some basic info on getting into showing (http://www.ukchihuahuas.co.uk/bg2showing/
I'll take a look about
am looking for a local chi club or dog club, but cant seem to find one near me.