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Does it sound like the dog is sucking in air quickly or choking/ gagging on something?
Does it come on at any time of the day or night?
What happens when you rub under her jaw?
It seems you may be offline now. Going by your description I am thinking you may be seeing a reverse sneeze which does sound like a collapse trachea.
I am going to direct you to a link that explains this and to a video of a dog doing a reverse sneeze. Some dogs are more dramatic than others but from the video you should be able to get an idea if it is the same thing you are seeing.
If it is not, since most things are hard to duplicate at a Vet office, you may want to video tape the dog going through this and show it to your vet.
Usually with a reverse sneeze if you rub up and down the neck area, the episode subsides sooner.