Great post! We do get a reprieve here with the cold winter months and I typically do not give heart worm meds December through February (of course depending on the weather - we have had some warmer than normal Decembers lately) that said, my two just got their second dose of the year on the 15th. I agree, this is something that I would never mess around with - I have seen mosquitoes in my house along with flies, ants and spiders
So I know they are sneaky and can get in even when we think they can't.