So my 10 year old Dachund has an enlarged heart?

and after getting a second opinion right away from a great Vet doctor, she was prescribed enalapril 2.5mg and furosemide 12.5 for the next 15 days until her next check-up. The first vet doctor gave her the wrong medications which could have potentially made her very worse. She had an EKC today and she is healthy and happy. All her other organs are healthy, blood pressure is fine, breathing is fine and no other issues. So my question is, have these two drugs been commonly successful for enlarged heart and for CHF? She's not in CHF stage yet either. She has very minor fluid but the doctor said that should be cleared up in days with the the medications. She eat's healthy and well, gets her exercise when the weather is good, and she is loved and happy.