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By stage three, the disease is having a real impact on your dog's health, and the heartworm symptoms are correspondingly more severe and noticeable.

Dogs will continue to cough, will experience fatigue after exercise, may be reluctant to exercise, and can have trouble breathing.

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In a way, yes. Your dog can feel the discomfort that goes hand-in-hand with the heartworms hatching from larvae stages into adulthood. They can also feel them migrating from one spot to another inside their body, specifically if they're affecting your dog's lungs and breathing.

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