Paraphrased from Dr. Judy Morgan:
Mosquitoes are the main way that heartworms are transmitted. There are 3 stages. The first 2 (L1 and L2 larvae) require temperatures above 80 F (27 C) for a minimum of two weeks to reach L3. That is the infection stage. So. while most veterinarians recommend year-round administration of heartworm preventative, it may only be required seasonally in some areas.
Since there are a lot of variables, Dr. Morgan wrote a blog to “…try and help you decide what kind of heartworm preventative may be recommended for your pet”.
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