RESEARCH ON SMELLING
This TED video on How dogs "see" with their noses, is informative
https://www.youtube.com/watch?v=p7fXa2Occ_U – (5 mins)
Smelling While SleepingSome dogs, sleeping by open windows, expand their nostrils when breathing in. This indicates that they are smelling while they are sleeping.
Though not conclusive : if you expand the nostrils and breathe in without smelling – warming and moistening the breath by its passage through the nasal canals – you will get a very sore throat.
Intensive SniffingWatch Feldhase, European hare, Lepus europaeus notice at 0.18 how they smell with incredibly short inhalations .
These quick inhalations are similar to some wine connoisseurs, but wine connoisseurs only do it once or twice.
Notice also the same from of sniffing in – Hedgehog Sniffs and Licks nose – this is real cute and shows the same sniffing method, but here we can see the body expanding and contracting. It must intensify the scent. How do they do it, and, how do they do it without getting dizzy or short of breath?
Another cute sniffing video (but 6 mins long) is – Hedgehog sniffs food on stairs, and climbs there to get it.
This video of a hare is also a good example, especially at 00.08 to 00.13 taking short sniffs through the nose.