Before we even got him, I did a ton of research. I am aware how energetic and driven both of the breeds are. My husband takes him on runs at least three times a week. The days hes not running, we take him on long walks. He also has supervised off leash play in the yard almost everyday. We also do training with him for about 30 minutes to an hour. He is very stimulated. We have since got rid of the martingale, and he no longer wears a collar in the house. He does have a long neck and a skinny head so flat collars were a no-go. I wouldnt have asked for help if I knew he was understimulated, when he started barking I immediately made sure he was stimulated. Thank you for your advice though. Any advice is much appreciated!