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Originally Posted by Lizzie07  I've never heard of a single case were this has happened with HW. |
There are lots of cases, especially in the south where dogs on preventative are testing positive for HW. Some will say it is because of poor compliance. Others say they have complied and followed the directions. However, in theory, just like any medication, if you do not follow the directions given, and an infected dog is receiving small dose every couple of months, it seems completely logical for the parasite to develop a resistance. Regardless of which side of the fence you are on, it is being watched by veterinarians and studied by the drug companies. All the more reason to test yearly. If nothing more than knowing your pet is parasite free, it does give the drug companies feedback that their products are continuing to work.