You know what....I didn't see your video until now!! It does not sound like CHF or a ruptured Chordae Tendonae to me and if they said her heart is good, then it isn't either of them.
Not sure why the mucous....but, she still could have CT which I am more inclined to think it is after seeing the video.
A little bit later on, I am going to put together a list of some things I have tried medication wise that you can ask your vet about. |