I asked my vet about just treating with heartworm meds during the mosquito season and her reply was that with the warm winters we have had, mosquitos are still alive even during the winter, so dogs should be treated year round. I use Sentinel because it also has the other worm protection in it and guards against fleas as well. The only downside is no tick protection. Ticks are not prevelent in my area and I don't like the smell of the topical stuff.
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