My whit GSD/ Alaksn Mal mix growled at me the other night and I am really upset about it. She is seven, and I just got her 6 months ago with a lot of issues. At first I could not take any type of food away from her. We worked on trading exercises and she was getting so much better, but then last night while we were working on it she started growling and snarling. In the end she dropped the bone, but it still worried me. We were making such progress with her. Any ideas of why she suddnally started growling again. There were no other dogs or people around, and we were in my house where we normally do the exercises, it was really just another normal situation that she was used to.