I was wondering if you can help, we take Merlin to training, he will wait for a minute at home/in the garden no problems. At training he gets excited and distracted , we have had a few new different dogs come and go. Do you think this why? or one other dog and three bitches in the class. He used to do waiting no problems. I call this problem (he is being a teenager) He is still only 17 months. If you have any ideas on how to help, I would be very grateful.