re: Update in OP; Treating young lab for heart worms

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i was also given the slow kill option but was advised against it due to high resistance rates.

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that's bullshite. its cheaper, that's why you were advised against it.
we had 3 rescue dogs all do the slow kill, it worked for every one of them. one of them being a 7 year old dog who was always outside and never on heartworm prevention