I think whatever their respective training all dogs use their noses and can therefore be described as sniffer dogs.
I'm sure that would be an OK description back in 2007.
We are far more sophisticated now.
Of course they use their noses
A dog or dogs used by an American international airport screen inbound passengers for carrying larger amounts of cash than they have declared. There was a particularly amusing incident when one Asian couple brought in a suitcase and box after box of 100US$ notes. There was so much, customs officers did not have the time to count the notes, so they weighed it. From that, the estimated value was 2.2 million.
Upon closer examination, Customs decided the notes were forgeries.
They asked the couple why they were carrying vast numbers of forged banknotes. The Asian couple explained they were going a family ceremony in the US, and in Asian culture you burn cash as an 'offering'. Their story checked out so they were permitted to leave.
Without the forged notes, which customs confiscated and incinerated.
It's clear that doggies do all sorts of fascinating things, many but not all using their nose. To classify all as sniffer dogs is overly simplistic. The 28 day period mentioned earlier might well be true for tracker dogs, I'm no expert.
But it did not apply to Eddie and Keela, because they were not tracker dogs,