I've been wondering the same thing. Have you heard any feedback about the Multigard treatment? I buy all of my pet meds online - IT'S SO MUCH CHEAPER!!
Sentinel can be purchased online and at your vet's office. It is essential that the dog have a heartworm test before giving any heartworm preventative..If there is larvae in the dog, the preventative will not work and can possibly cause death,,a test is first.
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