I have a 8 month old German Shepard!! Named Giles, He’s the sweetest boy and loves to play!! He has three dogs to play with here and he also goes to my sisters sometimes and plays with her dogs!! But what I don’t understand is every time we go to the park and he sees another dog, he suddenly sounds aggressive! Which I know he’s not!! Anyways I took him to a agility class last night! Because he loves jumping and running!! And I thought it would be good for us to spend time together training, but he barked so much and would not calm down at all that he had to sit out of class!! He would not let any dog or human come near him!! And I’m worried we will get kicked out!!! I don’t know what to do and my next class is in a week! I’m desperate for some advice!! Does anyone else have this problem!?