Wonder if it's feasible to have security measures such as checking of receipts for people leaving the building as such. There's seems to be no strict control over the entry and exit of the public at most shows. Maybe having two "checkers" at the exits to ensure all animals leaving the show are paid for may work. Having shirt tags for vendors would enable them easier passageway through this system too. Just offering some suggestions as it would suck if the potential of theft at shows turns away vendors from attending.
The Herp Room
"The day I tried to live, I wallowed in the blood and mud with all the other pigs" - C. Cornell