It sounds like a reverse sneeze. You can search for it on you tube, to see if it's similar. If its that, it sounds alot worse than it actually is, usually nothing to worry about...just rub throat while she is doing it, sometimes it helps. However, little dogs are prone to other cardiac/respiratory issues so take her to your vet to make sure it's not a collapsing trachea, heart disease or other serious issue. Dogs usually do not get asthma.