Heartworm antigen testing is the most reliable method of confirming that all of the adult heartworms have been eliminated. Although many dogs are antigen-negative 16 weeks after treatment, it can take longer for the antigen to be completely cleared from some dogs.
How long will a dog test positive for heartworms after treatment?
It is important to know that the heartworm test can remain positive for four-six months following treatment even if all worms were killed, so review the time line of your dog's therapy.
How soon after heartworm treatment will a dog test negative?
While 100% of adult worms might be dead at the 6-month point, residual heartworm antigen in circulation is detectable for a time and could lead to an invalid test result. Waiting an additional 3 months allows time for the antigen to be cleared from the dog.
How long does it take for heartworms to dissolve after treatment?
Once treated, the heartworms die slowly and begin to dissolve, taking several weeks. Three to four weeks later, your dog will begin phase two to get rid of the baby heartworms.
Can a dog recover from being heartworm positive?
Once a dog is infected with heartworms, the treatment and recovery period can be life-threatening and long. In fact, heartworm recovery can take several weeks or even months and is not always possible.
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