It's teeny tiny but I could see it. It seemed to me with the sound and the shaking of the head that it was almost like she had something stuck up there. Bunker had a thistle that worked its way up there and sometimes it didn't bother her at all and sometimes it must have moved and she would do the coughing/sneezing/shaking her head thing. The vet finally was able to find it with a scope that went way up her nose. Have they checked for something like that?