Some experts, and in particular Steven R Lindsay in his book «Handbook of Applied Dog Behavior and Training» establishes a few points on how shock dog collars work very well for deterring dogs and are effective for training, because they provide a curb
against undesirable behavior in dogs.
As mentioned above, it's a good idea to ask the attending staff or volunteers if they're aware of
any undesirable behaviors in the dog.
When challenging or
undesirable behaviors in dogs and people crop up I look for ways to manage them.