Since Beau was a rescue, my first thought was that a dog similar to Milo had once attacked him. But, you said he gets along with other dogs like Milo. So, my guess is its the scent.
My former boss had a Schnauzer that didn't like black men that he didn't know. His wife had gotten Leader at the District of Columbia Humane Society and they didn't know any of his background. Leader didn't attack anyone -- he just barked at them like crazy! If Leader knew the men he was fine -- it was just the ones he didn't know. I loved it when he brought Leader to the office so I could get my "dog fix"!
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Britton and Adrian, Michigan
Alexandria and Falls Church, Virginia
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