Preparation of Dogs for Exhibition......No substance which alters the natural colour, texture or body of the coat may be used in the preparation of a dog for exhibition, either before or at the show. Any other substance which may be used in the preparation of a dog for exhibition must not be allowed to remain in the coat of a dog at the time of exhibition. Dry white chalk in block form may be used for the cleaning but must be removed from the coat before the dog enters the ring. No other substance may be used for cleaning within the precincts of the show.