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Originally Posted by jp4m2  Yes, I see the testing is required.  . I had put it in my first post that it was for the links but I think it wasn't clear to some so I felt I needed to clarify that.
The point was that Merial was claiming it was 100 percent effective but it's looking like it isn't so some pet owners are not happy when the testing is coming up positive for heart worms, and rightly so. I don't know if it's just Heartgard Plus or if it includes Heartgard too. |
While I wouldn't be surprised by proof of heartworm mutation resistant to the preventatives, there are so many variables as indicated in the article that could be contributing to dogs coming up positive for HW. We have to rely on pet owners that they absolutely sure they gave the preventative each month and that they were absolutely certain their dog did not vomit or expel the preventative (even the best pet owners can make mistakes), tests were given regularly (how reliable were the tests? were they snap tests done in the vet's office or sent to the lab?) and so on.