Screened porch time and a mosquito conversation, apparently a running theme in this state too
Ace has his little supervised spot out there most evenings once the Green Bay humidity settles in a bit, seemed harmless enough to me. Vet brought up the same screen-gap point I've seen mentioned here before, confirmed prevention stays necessary regardless of how sealed it looks. Kept him on schedule year round after that, no exceptions just because he's technically indoor-only.
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This screen misconception really does come up constantly, good thing the vet caught it before it became an actual issue. There's a solid piece explaining exactly why this matters: https://allinpets.com/blog/dogs/heartworm-prevention-for-dogs-doses-testing-and-treatment-63/