My partners dog was neutered when he was around 5 or 6 months old, not exactly sure when but he's got the papers as proof and has been immunised and given the full works.
However, he has taken recently (3 years next week) to trying to hump people, only females. He doesn't completely but does the mounting position, thrusts his chest forward and swings his hips backwards and forwards behind the person in question if they are leaning down to do anything.
My question is do neutered dogs normally do this? I thought their 'urges' stopped once they got doctored, but I could be wrong.