Must read article on heartworms.
This post is an informative article written and copyrighted by Bulloved Bulldogs, it can be found here: http://www.blakkatz.com/spellcast/HW.pdf
Heartworm: A Realistic Look
Heartworm is of concern to all dog owners, and is a potentially serious, sometimes even fatal, disease. It is not, however, the unavoidable scourge that many vets and pharmaceutical companies would have us believe. If your dog is reasonably healthy, eating a SARF diet, is vaccine free, is not currently on any HW “preventives” or chemical flea and tick preventives, his immune system should be strong enough to fight off a heartworm infestation with none of the larvae reaching adulthood. In the event that some of the larvae should manage to get past your dog’s immune system defenses and survive to adulthood, it is still far from a death sentence. They will be much weakened, and the truly healthy dog will make a less hospitable host. Even at the adult stage…
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