はい、ジェネリックではない正規のハートガードです。

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You can cancel any time and your next delivery will be stopped as long as it's before the regular shipment date. The price should stay the same as it always has, although we will notify you if there was ever to be a change.

Unfortunately we are unable to provide the answer to this question since it can be possible for different animals to react in different way's outside of normal applications and dosages. I suggest consulting your vet to make sure. Outside of this, it is common for some pets to have both treatments at once.