First of all, welcome to the forum. So very sorry you have come here under these circumstances. My Baron was diagnosed last February at 4 years 4 months with DCM: http://www.dobermantalk.com/doberman-health/53082-baron-has-dcm.html
As he is still in early stage, he is currently only on Sotalol (80 mg every 12 hours) and 2,000 mg of fish oil. I cannot help you with any information on the other drugs your Dobe is on but I am sure someone else with more experience will chime in. As far as your cardiologist goes, make sure you find someone you are comfortable with and you feel is giving your Dobe the best chance for some more quality life. My thoughts and prayers are with your girl. Please post some photos of her. We love to see senior Dobes.
As he is still in early stage, he is currently only on Sotalol (80 mg every 12 hours) and 2,000 mg of fish oil. I cannot help you with any information on the other drugs your Dobe is on but I am sure someone else with more experience will chime in. As far as your cardiologist goes, make sure you find someone you are comfortable with and you feel is giving your Dobe the best chance for some more quality life. My thoughts and prayers are with your girl. Please post some photos of her. We love to see senior Dobes.