Hi,
My Doberman seems to have an excellent temperament. When we got him he was very friendly and still is. He doesn’t even bark at strangers yet and he is 10 months old. I can take his food away from him, clean his paws e.t.c and he lets me. He is fairly obedient, he will sit, stay, come, down and wait for a command before he eats. Out of the home he is a lot less obedient but does listen on occasion.
However recently there have been a few occasions where he has barked at me. He is only allowed downstairs and he tries to come upstairs but we never let him. A few weeks ago my sister told him off for comming upstairs and he growled at her then began to bark. He had never done this previously. She walked away as she was a little shocked. (I dont think she should have done this).
Then he did the same to me. I am not sure if he growled but he began to bark at me. I shouted at him and he continued. Then I went up to him and he began to go to the floor and come up and did that a few times. (He does that when he plays sometimes).
He did the same again just today and I just called in my brother and he stopped (I think this is because he was excited to see my brother).
He did the same again to me when I was spraying dog deodorant on him. I can normally put dog deodorant on him with no problems, however he began to bark at me when I did so this time. He was actually barking more so at the deodorant bottle. He kept on barking, going down and running near me a bit, then coming back and barking. He even did like a pretend bite on the bottle (just opened and closed his mouth near the bottle).
Should I be worried? If he barks at me again what should I do? I don’t want any aggressive behaviour towards me or my family from him. I would appreciate any help.

