I have a dog who is coughing after drinking, pretty much every time she takes a drink. She coughs and then sometimes follows the cough with some gagging noises. She has done this since being a puppy, and most of the time when coughing, she coughs up some water and/or mucus.

I've looked at a few articles, and searched for "coughing after drinking" in both r/DogCare and r/Dogs. There were some results in r/Dogs, but none of them seem to be the issue I have with this dog.

This dog has been taken to several different vets, and at least two of them had done xrays and haven't seen anything that led them to believe she would have any drinking issues.

I don't believe this is a trachea issue or over excited drinking issue. One, because xrays don't seem to show any trachea issues. And this dog is rarely, if ever, acting excited.

Apologies for the long text, but any ideas/advice are more than welcome to share here. Thank you.