I can smell in the past, so to speak.
I would say that I have a dawg's nose, but dawgs seem to only have four re-actions to what they smell, such as, Eat-it, Piss-on-it, Fuck-it, or Run-away.
I may react quite differently, but possibly some elements of all four of the previously described "typical" reactions may also be included.
Rotten eggs abound with history to a refined sniffer.