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  Continued:Also because it's a liquid, the dose can be measured out to match your pets weight exactly, while with other htw meds smaller Yorkies end up getting 2-10 times the amount they normally need. And you only have to use this one product because it handles ticks, fleas, and mites too. It is a parasiticide, as are all Heartworm medications/products, but getting hwtwm disease would be worse. Also, you can bathe your dog after 2 hours of application. And as a topical, it does it's job before it goes through the liver, not after as with oral meds.
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