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Canine Heartworm

RingMaster RingMstr at attcanada.ca
Tue May 1 04:49:06 EST 2001

I have been noticing a number of products advertised on Television that
prevent canine heartworm infection. However, they all warn that the dog
should be tested for heartworm BEFORE taking the product.

Is there a biological reason for not giving the preventive medication to a
dog already infected with heartworm? Or, is it simply a marketing ploy to
avoid an owner claiming that the medication did not prevent the heartworm


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