I'm glad you aren't listening to the advice to exercise. That would be disasterous. I agree that a good talk with your vet is in order. In this case, you might want to consider a tranqualizer until the heartworms are gone and you can begin an exercise program. However, a tranqualizer also might stress the heart, so have a good talk with your doctor. The extreme stress the dog is under when you leave is also a concern (as you know), and your vet will need to know this to help you develop a good plan for you and Dasher. You're being a good mom!