Here in Spain we do not have that many Dobes at the shows so we tend to have them paraded one at a time so avoiding the issue of male on male aggression.
When they do have to go into the ring together they are always kept well apart. The Dobe ring is always one of the biggest I have noticed used later by the Stamfords, the Rotties, the Mastif's etc. etc so allowing enough room to avoid close quarter encounters.
Outside the ring I have seen many fights involving a variety of breeds some of whom you would not associate with aggression persay. At the last show I came to a conclusion. The majority of people who show here in Spain are not what I call 'Dog People'. I can safely say that every fight was caused through the people not understanding body language on their dogs behalf. Which to me says they are not 'Dog People' they don't even listen to the rumblings dogs make or the snapping half the time. Instead they are too busy I swear trying to look either 'Macho' with their big dog, 'super cool' or just 'fashionable'. No end of times they walk around as if in a dreamworld blithely allowing their dogs to foul the hall in which they are showing followed by barge up and sniff or worse other dogs to which some obviously take a dislike. Half the time the dogs are left unattended, their owners having popped their dogs into crates and then disappeared for coffees or so they could go chat with their friends and parade up and down with their numbers on their arms as if they were famous actors or the like and were expectant of adoration.
At the last show, one woman having preened her Chow to perfection left it standing hooked up to the grooming gibbet as I call it and disappeared off to the loo or wherever, whereupon the Chow promptly became distracted and jumped off the table and hung itself. It took several people risking life and limb might I add as the dog was terrified to save it from hanging itself. When the woman came back, was she grateful, NO! she just started screaming the other exhibitors were trying to sabotage her dogs chances by scruffing him up.
UNBELIEVABLE.