I know you are asking about Senior GSD with that problem... my last dog Saint Bernard had it and died last summer, he was diagnosed with enlarged heart and within days had serious problems breathing and had blood in his lungs and had to be put down. He was 10 years old (which is old for a St. Bernard). Jesse is a full breed GSD puppy and he has helped me get over the pain of losing Jed the Saint Bernard. I am very very sorry to hear about your sweet girl and I hope all the medicine helps her.