> Dogs are domesticated allready, so aggression from a dog is different than aggression from a non-domesticated animal. For me, the question of 'nature v's nurture', in relation to the behaviour of domesticated animals, is still unanswered.

Thanks Mastifflover - that's what I was trying to say.
Too many variables too.  The foxes having been bred over 50 ish years and the wolves only 1 generation doesn't compare equally.  As for the wolves, i can't remember the name of the programme but there was one with a man living with a pack of wolves that was decried as having false outcomes because of his influence - this surely means that human interaction [nurture] does influence behaviour in wolves? 
What I was also trying to say in a previous post is that the expectations of the humans will differ between species. Just like fear of dogs is/can be influenced by the size and reputation of a breed so the difference may be seen between wolves and foxes; maybe compare them to the different attitudes towards Rottweilers and Tibetan Terriers.  With humans, the attitudes, and therefore interactions, can differ quite subtly dependant upon what is expected of the others - think of how teachers have behaved towards different kids in school depending on where they come from and their initial behaviours - if they are a bit 'rough' at first they may always be treated with that probability in mind