I want a piriton free dog owning experience. Heavy shedding labs bring me out in a rash, although it could be the saliva and dander too. Could you help figure out which LD I should own: F1, F1a/b, Multi - I really don't know too much about the differences but I have seen a flat coated LD that looked beautiful. I am in London, UK but am posting on this site because you all seem so helpful. Thanks in advance.