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Hello and thank you for using this site to help you. It is that time of year where we see a lot more reverse sneezing which would show sudden onset at random times of the day of a dog seeming to choke or gag on something. The episodes can last from a few seconds to a few minutes and then they subside as quickly as they came on. This is thought to be caused by allergies to airborne particles but it is not definite. It seems to coincide with the spring and fall months mostly but this can happen at any time. This is common in dogs and nothing to worry about
That being said, because of the breed of dog you have a collapse trachea can present similar symptoms so it is worth getting a hands on exam at some point.
I am going to direct you to links that go over a reverse sneeze and tracheal collapse for more information so you are prepared to discuss either with your vet. I would also suggest that you video tape the dog doing this so you can show it to your Vet as dogs don't often duplicate what they do at home in a vet office. It can also save you from expensive testing.
reverse sneezing https://www.youtube.com/watch?v=puFXxq2Z7Bs
video of a dog with reverse sneeze https://www.youtube.com/watch?v=U3L4v0W2_Sw
Tracheal collapse http://www.petplace.com/article/dogs/diseases-conditions-of-dogs/lungs-airways-chest/tracheal-collapse-collapsing-trachea-in-dogs