
I think it may depend on the show? If you look in a schedule it will say the policy about it for that show.
This is from the SKC Aug schedule:
PHOTOGRAPHY AND FILMING: The taking of photographs in the exhibition premises for sale or reward is strictly
prohibited except with the written permission of the Organisers. The Organisers reserve the right at their absolute
discretion to confiscate cameras and/or films for infringement of this condition. There is no objection to the general
public taking photographs or video film of general views of the Show, provided that these are for private use only.
Specific dogs may be photographed only with the approval of the exhibitor.
No photography or filming is permitted in breed judging rings whilst judging is actually taking place. However, judges
may allow it to happen at the end of classes or after the Challenge Certiticate is awarded.
Filming and flash photography is allowed from outside the rings at all times unless the operation of the camera is
actually affecting exhibits. However, if a powerful flash unit is used or it is clear that exhibits are being affected, a
ring steward or the Judge is empowered to stop the person concerned.
Cinematograph or television equipment may only be used at the Show if a permit has been issued by the Organisers.
There are also certain restrictions on the use of cameras for still photography and private video films.