Training dogs, especially large breed dogs like great Danes can be very challenging. Our great Dane is a rescue dog that was found wandering the streets and he was already two years old when we got him and had been in and out of shelter systems. Collar training was a must.you owe it to yourself and to your longevity and prosperity to train them. Click the shopping bag for the link. #DogTraining #Collar #GreatDane #ReactiveDogs #ReactiveTraining #OffLeashTraining #DogCollar.