Report Barking while waiting to run the agility course in Obedience, Agility, and Flyball Posted July 2, 2017 It is a very common border collie problem. If you google these boards for reactivity you will find loads of threads with dogs having the same behavior. My first agility dog turned into a raving lunatic once we started training with other dogs really running. Members of these boards introduced me to a book called Controled Unleashed and we worked our way through some of the exercises and it really helped him. There are two versions of the book and I understand the puppy book is easier to work with, although called puppy it is still applicable to all dogs.