I have two dogs. One a 17month old Staffie cross Greyhound, and a 3 year Old Lurcher. And they fight...not all the time and can be fine but when they go for it they bare teeth and make a racket. Apart from that they are pretty good. The younger used to bark alot and we are slowly getting a handle on that...by ingnoring it or when he does it in front of use getting up and leaving the room.  But I cannot think of anything to stop them, Spraying the dogs stops them for a it but they do start again. The rest of the time they are fine, The fighting is almost always started by the younger and although the Older is far stronger and usually gets the upper hand, Sometimes decides discrention is the better part of valour and runs about until we can turn about and take Liuca from behind.

Will he grow out of this and is he trying the boundaries. Which is head dog Luca bacause he is the more aggressive or Davy even though he sometimes backs down ? Is there anyway to stop this and try and advert them for this ?

If it's just 'bare teeth and make a racket' then they are just being normal dogs.  If they are getting injured then you have a problem.  I see from your earlier posts that the younger one had 'food aggression' problems when you took him on.  Is it food or possesions that are triggering the incidents?
Sally