Sad news. I know how you feel. I love animals and do anything it takes to take care of them. I was a volunteer at an animal shelter for 10 years and I know heart worm is a very serious problem. And it takes serious care by a vet. I doubt if there are any home remedies. If you found him as a stray, his owner probably abandoned him, maybe because he knew the dog had heart worm. I would go to the SPCA, Humane Society, or your town animal shelter (i.e.dog pound) and see if you can get any help. Someone may be able to help you, especially if it's a young dog. And please let me know how you make out. We have 4 dogs and 3 cats and do anything it takes to keep them healthy even though we are on limited income.