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My dog has heartworm. Can he get doxycycline after his first shot?

Updated On September 23rd, 2025

Pet's info: Dog | American Pit Bull Terrier | Male | neutered | 3 years and 3 months old | 48 lbs

A heartworm positive dog being treated by the three shot protocol treatment. Can this dog be given doxycycline after the first heartworm treatment shot.? I ask because he was never put on 30 days doxycycline prior to the first shot. His final two shots are the 25th and 26th of this month of August. If he needs doxycycline, how much and how often should he have it. He's 48 lb 3 years old good weight

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Answered By Susan England-Foster

Veterinarian

Published on August 4th, 2017

I would recommend putting dozer on a 30 day course of antibiotics before the 2nd and 3rd injection. I would recommend consulting your vet for the medication and the proper dose. The antibiotic will kill the bacteria that live in the mircofilaria and are though to cause more inflammation.

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