I'll try to answer your question briefly this morning and I will address this and the other questions I'm getting more thoroughly when I get home.
You should always do a lot of investigating when you choose your handler or before you ever send a dog out. Don't be afraid to ask them and other handlers or owners what the reputation is.
If a dog is sent out with a handler to be campaigned you should know where the dog sleeps at night while traveling, how often are they walked, how much exercise will they get on the road, where they live when they are at the home, who feeds them, what do they feed them, who works and trains them, how often do they get exercised, how often do they get played with, how much personal time are they getting, how often are they groomed.
A dog can be ruined when it is taken away from a secure environment and passed around, not fed properly, neglected or even worse abused. Your breeder should also know what you are doing they may know something about the handler you choose or have suggestions on who you should use. What breeder in their right mind would want a dog out with someone who doesn't feed properly, neglects or abuses your dog, or leaves them sitting in a car all day and night not being taken care of while the handlers party? Also make sure the stud arrangements are in writing, you don't want your male passed around and used to get diseases and ruined or your bitch bred by accident because no one was taking care of her and watching her.
Just some things to think about.