Dealing With Aggression In Your German Shepherd

As my German Shepherd was gnawing on a bone, I went to take it away from him and he growled at me; he curled back his lips, baring his teeth.
I was shocked by his aggressive display but I knew that this was the moment to stop it permanently. Without saying a word, I took him by the collar and led him to his timeout area.
There was no reason to speak to him, by showing that I was displeased and banishing him, he was able to be alone and understand the gravity in his mistake.
I figured ten minutes alone would suffice and then invited him back into my space. Thankfully, he behaved himself and we didnt need to repeat the procedure.