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Can I put my dog on heartworm medicine without testing?

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Any Q

Even if you give the medication as recommended, your dog may spit out or vomit a heartworm pill—or rub off a topical medication. Heartworm preventives are highly effective, but not 100 percent effective. If you don't get your dog test, you won't know your dog needs treatment.


Can you give a dog heartworm medicine without testing?

If a heartworm-positive dog is not tested before starting a preventive, the dog will remain infected with adult heartworms until it gets sick enough to show symptoms. Heartworm preventives do not kill adult heartworms. Also, giving a heartworm preventive to a dog infected with adult heartworms may be harmful or deadly.

Can you give Heartgard without a test?

The American Heartworm Society recommends annual heartworm testing. It's important to never give Heartgard to any pet that has not been tested for heartworm disease. Heartworm preventative medication such as Heartgard cannot kill adult heartworms, but instead kills the baby heartworms known as microfilariae.

Can you get heartworm medication without a vet prescription?

All effective heartworm medications require a prescription in the United States. It is illegal to obtain an FDA-approved prescription medication without a prescription.

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