Well, sometimes in fact MOST TIMES people DECLINE tests as "optional". This is different than a regular GI problem or something.
You can press on your dogs neck and they DO NOT COUGH if they are normal so it's not like their BANGING ON IT or CHOKING them.
In this case, options are limited.
I would NEVER EVER do an endoscopy they are high risk and could make matters worse.
ONLY if it's life or death.
So your options are kind of limited for diagnosis when you compare the RISK of anesthesia, too. It is NOT always visable on an xray and a flouroscopy requires anesthesia. Especially in a small dog and especially IF they have a trachea defect/issue.
Thank you for the update as every anecdotal story is helpful to learn new things. I also wanted to rule out megaesophagus which may look the same at first but usually when eating or drinking or shortly after.
Special Procedure: Fluoroscopy - CVM - VetMedCenter AVID, University of Minnesota
Tracheal Collapse in Dogs: Signs, Causes, and Treatment