Barb's dog has a heart problem so here is a thread all about this stuff and how to prevent/treat these conditions...
Dilated Cardiomyopathy (Heart Disease)
Update on my Corky
My number one recomendation is a healthy diet, fish oil supplementation, and plenty of cardiovascular exercise to prevent heart problems. What are you feeding the dog? Now that your dog must have one, it would depend of the specific diagnosis your dogs has to determine the best approach for treatment.
What specific heart condition does the dog have? What current med is it on?