Why is heartworm prevention so important even in the winter months? Heartworms are transmitted by mosquitos anytime the air temperature is 50'F or greater. The mosquito injects a tiny worm under the dog's skin where it hides from our medications and matures for 60-90 days when it finally enters the blood stream and is killed by the preventatives. That means the January dose of medication is killing worms that were injected in Sept-Oct. Year round monthly prevention is an important part of your pet's healthcare regimine.
Pictured: canine heart filled with adult heartworms.
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