Heartworm infestations

N. writes: >My only concern is that after reading it, heartworm
infestation of a dog sounds like an almost impossibly unlikely event
even during periods of sustained warm temps.<

Well, down here in Texas, whenever a dog comes into rescue, the first thing we test for is heartworms -- you can just about assume that a dog that's been out and about, no matter the weather, is going to be infested, some of them just horribly. Way too few people know or care about protecting their dogs (and outdoor cats). Even when we get a good freeze, you can bet that, when the next warm day comes around, we'll be plagued by skeeters again. There are just too many hidey-holes for them to be killed off. The times I've spent in upstate NY, I didn't notice any marked lack of skeeters either, despite the harsh winters ... Heartworm treatment often just has to be part of the foster/rescue process, and one of the reasons we work so hard to raise money ... believe me, prevention is a lot cheaper, and a LOT less hard on the dog!
My depreciated $.02 ...