Hi there...sorry to hear that your dog is not well. This sounds like a very frustrating problem! It sounds like your vet is doing all of the right things. It looks like we are trying to find whether there is something stuck in her throat.
Has she had a thorough oral exam under anesthetic? That would be my next step. I would want to examine each of her teeth and all of her mouth and as far back into her throat as possible. Ideally, an endoscopic exam of the esophagus would be great, but not all vets have the equipment to do that.
Another thought is that she may have a condition called laryngeal paralysis. When this happens, the larynx doesn't open all of the way and it becomes difficult to breath. The way to diagnose this is by administering a light anesthetic and watching her larynx open and close. There is a surgery to fix this, but it is often expensive and can have side effects.
If you have financial constraints you could ask your vet to prescribe some antibiotics (in case there is a foreign object causing an infection) along with some bronchodilators to help with the breathing.
I hope this information helps! If you have more concerns, then hit reply. Or, if my answer is sufficient please hit accept. I'm in appointments this afternoon so I may not be able to respond immediately. Thanks!Dr. Marie
Oh..this is good that she is having the endoscopic exam. When you go in it would be great to ask the doctors if they think this could be laryngeal paralysis. (It doesn't totally fit because there shouldn't be drooling with this, but it is still possible.)
When they do the deep anesthetic, they initially administer an IV medication called an induction agent. Then, they place an endotracheal tube. All they need to do is monitor the larynx for a few breaths before the tube goes into place to see if both sides of the arytenoids (larynx cartilage) are moving like they should. It is usually quite obvious.
It sounds like your dog is under great care though and I think your vets are right on track!
I hope you get an answer!
You're very welcome! I hope all goes well!