I have two cats, and will blog about them periodically. Coco Bear is 12, and Calypso is 2. They both spend a large amount of time in an outdoor enclosure spring through fall. This enclosure is screened, but definitely not mosquito-proof, so I have traditionally given them Heartguard, a heartworm prevention medication, starting in late April and going through late October/early November. We have a short, but fierce, mosquito season in Minnesota (we joke that mosquitoes here are so big that they’re our state bird). Heartworm is extremely serious and often fatal in cats, and it is caused by mosquitoes, so to me an ounce of prevention is well worth the cost of the Heartguard.
Some vets now advocate giving heartworm prevention year-round. This article gives an interesting perspective on that, and argues against year-round treatment in most US locations. I wanted to share it with my cat loving friends in the US.