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Normally when it is too late to treat. A dog will not usually show symptoms of being infected with heartworms until the number of heartworms becomes very large in the heart. Therefore the chances of treatment working is not as good as too many heartworms in the heart to clog the heart valves as they die off due to treatment.

This is the reason to have your dog checked first for heartworms then put on once a month treatment to prevent the H/W. Also your Veterinarian should test your dog once a year for H/W just to be on the safe side.

Symptoms of a severe case of heartworms include coughing, tired all the time, color is not good, bluish at times, etc.

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12y ago
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4mo ago

Signs of heartworm disease can start showing in dogs around 6 months after infection. Common symptoms include coughing, exercise intolerance, weight loss, and difficulty breathing. Regular testing and preventive measures are important for protecting your dog from heartworm disease.

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Q: When do the signs of heartworms start showing in dogs?
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