Your little one is probably doing what they call reverse sneezing.  Sounds like gagging or coughing, etc.  She may have sniffed pollen, etc. into her nose.  Sometimes this also happens without being outside.  Gently rub her neck and body when this happens talking to her while doing this.  Most times it doesn't last long.  Also the smaller dogs may have issues with their trechea.  If you are using a collar when walking use a harness instead.  It takes the pressure off of their necks.

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:The other day our Maltese, Misha was acting totoally normal.  We went on a small stroll up a dirt trail and stopped for a while. She was walking around the area and we think she may have been eating grass.  Suddenly she came over to us and was having issues breathing and kept trying to swallow.  We thought she just had a piece of grass stuck in her throat and was trying to swallow it.  Ever since then, she sounds like her nose is really "stuffed up" like when you get a cold.  She can breath through her mouth fine. We've tried benadryl and an anti-inflammatory from the vet, thinking it's an alergic reaction that is causing some swelling, but still now luck.  She still has her apet ite.  She's constantly gasping and snorting because it isn't natural for her to breath through her mouth and she's frea ked out by it.  The next step is a very expensive nasal scope.
:I'm looking for somone who has had a similar problem and found the solution!
:HELP!