I have a dog that has had a quick hacking cough since I got him and the vet told me acid reflux. This is how his cough sounds like. Like the chi in the video: Usually if they have acid reflux they also vomit too.
http://youtu.be/lN1L1pXdfZM
The second video is a reverse sneeze
http://youtu.be/U3L4v0W2_Sw