Hope it's the right place for asking help. Well, I am totally new to German Shepherd, just adopted a 6-month old puppy (Atom). He is very active and aggressive, but when I take him to local park to run and chase Go-Go Dog Pal, but he shows no interest. Other dogs in the park love to run for chasing this interactive dog toy. Can anyone suggest me what I do to create his interest in running and chasing toys?