Ollie barks at specific men. It's always men but not every man he meets. There's an instructor at agility (a man) that he had never met before, but just took an instant dislike to him and was barking at him. I just put it down to that the man has something on him that Ollie doesn't like (such as smoke for example) and it doesn't happen too often anyway.

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I OWN A CHOCOLATE ROAN COCKER SPANIEL
RIP David xx Run free at the bridge. Love you always xx 19th February 2011
RIP Jack and Mickey xx Run free at the bridge. Love you forever xx 20th June 2011