The basis of breed shows is the judging of dogs against the 'Breed Standard', which is the prescribed blueprint of the particular breed of dog. For all licensed breed shows, The Kennel Club Breed Standards must be used for the judging of dogs.
The Breed Standards are owned by The Kennel Club, and all changes are subject to approval by The Kennel Club General Committee. New Breed Standards, for newly recognised breeds, are drawn up once the breed has become sufficiently established within the UK. Careful research is conducted into the historical background, health and temperament of any new breed before Kennel Club recognition is granted. The Kennel Club currently recognises 196 breeds.
For Chihuahuas, the standards for the two breeds are identical except for the description of the coat. In December 2007 they were amended to specifically exclude merle coloration. They were further amended in October 2009 following discussions with The Kennel Club to address possible breed health concerns.
Standard for Chihuahua (Smooth Coat)
both by kind permission from The Kennel Club
by Laurence Fitt-Savage