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Hello and thank you for using this site to help you. If it sound like something is caught in the throat and the episodes come on randomly and dissappear just as quickly, maybe lasting a couple of seconds to a couple of minutes you may be looking at a reverse sneeze which is pretty common in dogs. This is thought to be brought on by an allergy. Most notice it in a change of seasons, but it can happen any time of year. This is not something to worry about.
Because this is a Min Pin there is another ailment which would be more serious and it sounds similar to reverse sneezing and this would be a collapsed trachea which would need to be identified by your vet.
I am going to direct you to a site on both reverse sneezing and collape trachea for further reading and to make an informed decision .
Reverse sneeze video https://www.youtube.com/watch?v=U3L4v0W2_Sw
Reverse sneeze : Dr K Becker https://www.youtube.com/watch?v=puFXxq2Z7Bs
Collapse trachea http://www.peteducation.com/article.cfm?c=2+2096&aid=410