I take it you did not crate train them? Neuter would be the first thing to do then start crate training. Feed them in their crates so they know that is a good place to be and this will curb along with neutering some of his issues. At 11 months he is acting out but does not totally understand why yet. Neutering will help greatly curb much of this. Good Luck.
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No I am not a Miniature Doberman, I was around 200 years before Louis Doberman created the Dobie and as for my friends the Manx cats, yes they are better at playing fetch than I am, I am a Miniature Pinscher.
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It's been a while!! HELP!! 
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