Dogs and Oranges

Amazing effects!
We used to have a poodle and when you would crack an orange in the downstairs kitchen, she would immediately come running from upstairs as the molecules released would be immediately detected by the dog’s extraordinary nose.
Always the same pattern.
Start to peel the orange, next you’d hear some commotion upstairs and dog feet hitting the floor, and a rapid descent to arrive at wherever you were standing. 10 seconds or less!
I figure the oranges were highly addictive (part of 1 is more than enough for a dog at a time).