First, the intrinsic reward for the dog comes from doing a job she enjoys, the feeling of doing that job well, and the praise she receives for it. The second type of reward comes from something completely independent of the task such as food, a ball, or a tug toy given as an addition afterwards, an extrinsic reward. Learning from actions which are enjoyable and the dog wants or is almost compelled to do because of its natural instincts, are easily rewarded. These actions can then be further reinforced through recognition in the form of praise and petting. Linked with what the dog enjoys, verbal praise becomes a strong reward in itself.
Actions and training routines which need encouragement and may be slightly more tedious or boring to the dog can be rewarded with something at the end which is enjoyable - such as a game of retrieve. However, should routines be boring? Or can we make the majority of them far more enjoyable by using even what can be considered extrinsic rewards as an integral part of the training exercise and not just something added on at the end. The reward is then the exercise and the training session, which when additionally reinforced through praise and recognition of a job well done, develops the dog much quicker. In addition, the bond between trainer and dog will also grow at an increased rate.