I certainly do not know of any friends who have done this but it is a great way to work on advanced dog training. (dogingtonpost.com)
I personally have no interest in advanced Dog training. (thethreedogblog.com)
Cristin's focus was more on competition training to start, but after acquiring a dog that suffered from fear aggression and resource guarding, she decided to take Canine Trade Group's advanced dog training course in order to learn how to help her dog become a more comfortable and relaxed part of the family. (blueridgedogtraining.com)