The personality of a dog is flexible and indeterminate. Dogs can be exuberant or shy; friendly or hostile; fearful or bold; aggressive or passive or some combination of the above. These differences in personality may to some extent be determined by breed, or individual genetics, but for the most part it is based on how and to what extent each particular dog has been socialized.
The origins of all training, such as Schutzhund or IPO, are based in Germany. These training tests were developed as a primary method of producing top level German Shepherd Dogs. They were geared to identify suitability of individual dogs for work in several formats
If you’re not directly familiar with clicker training, you might be a little confused on what exactly this style of training is all about. It is a newer style (although has been known and used for many decades) of training in the sense that it took a while for dog trainers to really hook onto it.