Or a dead pig was placed behind a curtain, in a cupboard, in a car all belonging to the McCanns where a child disappeared. Perhaps the previous occupants could explain this. what the hell were they doing with a dead pig- which let's face it, can't be hidden very well. I mean someone would notice surely. And of course we have to facto in the dead pig wearing soiled nappies... Just to make THAT story stick.
Now you are being facetious. Obviously there was no dead pig in these areas, neither was there cadaver scent IMO In the bedroom Eddie dismissed the room and walked away, if it hadn't been for Martin Grime calling him back he wouldn't have alerted to the room. IMO Eddie smelt something probably blood that been on something and had then been removed. Or he decided to bark so that he could put an end to the search.
Eddie alerted to the exact spot that Keela did behind the sofa, so there again Eddie alerted to blood.
There were families in 5a after the McCann's.