July 2011 Issue
Some Heartworm Preventative Medications Have Become Less Effective - Here's How to Protect Your Dog!
The protocols used to protect dogs from heartworm may have lost some effectiveness; heres what you can do to protect your dog now.
As we reported in Whole Dog Journal in March 2011, there is now ample evidence that at least one strain of heartworms has developed resistance to some of the markets best-known preventives. In addition, there is evidence to suggest that one of the most popular heartworm preventives, Heartgard, has an efficacy rate of less than 100 percent. The U.S. Food and Drug Administrations Center for Veterinary Medicine has sent at least one warning letter to Merial, the maker of Heartgard, asking the company to stop claiming 100 percent effectiveness for heartworm prevention. Given these developments, what should responsible dog owners do differently to better protect their dogs? The answer depends a bit on where you live and what youve already been doing to prevent heartworm infection.
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