Schutzhund training, like the sport itself, has evolved over the years. Schutzhund is very much a hands-on sport. Though there are theory and techniques about training dogs, most of the training is done in clubs among other people and dogs. In a club environment, handlers and their dogs gather to practice techniques with the club equipment and experienced handlers in bite suits, called "decoys". Decoys have their own training and certification processes, and a good decoy is important in training your dog.