Heartworm transmission occurs primarily through the bite of an infected mosquito. When a mosquito bites a dog that has heartworms, it can pick up the heartworm larvae (microfilariae) present in the dog's bloodstream. These larvae then develop into infective larvae within the mosquito over a period of about 10 to 14 days. Once the mosquito bites another dog, it can transmit these infective larvae into the dog's bloodstream.

It's important to note that heartworms cannot be transmitted directly from one dog to another; the mosquito is a necessary part of the life cycle. Additionally, heartworm disease can be serious and is preventable through regular use of heartworm prevention medications. Dogs should be tested for heartworms annually, especially in areas where mosquitoes are prevalent.

For example, if you live in a warm, humid climate, it's crucial to maintain a consistent heartworm prevention regimen, as mosquitoes thrive in those conditions.

Overall, keeping your dog on a preventive medication and minimizing mosquito exposure can greatly reduce the risk of heartworm infection.

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Topics covered in this question:

Dog Health Preventive Care Heartworm Dog Disease Mosquito Transmission