I did talk with the Heartgard manufacturer today, and did not get the news I would have liked. There seems to be some resistance to the heartworm treatments developing. The rep said that is definitely in the Mississippi Delta, but is probably moving North. She says it is not just Heartgard, but all of the preventives. I plan to give Kenzi Heartgard through September, then change her to ProHeart. I may continue to give Heartgard for the parasite (Hooks, etc.)control, but I will not depend on it for heartworm preventive.
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