You might assume that because heartworm disease makes its way to dogs via mosquitoes, those dogs who live where temperatures fall too low to support mosquito life don’t need year-round protection from this illness, which can cause lasting damage not only to the heart but also the lungs and arteries. But mosquito species keep adapting to better withstand cold climates. And some mosquitoes do perfectly fine huddling up in homes over the winter months. That’s no doubt at least part of the reason that heartworm disease has found new footholds in cooler, dryer regions.
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