Rocket's annual test came back clean, dry climate assumption officially retired for good
Went in for his checkup and the vet ran the test given his supervised evening yard time, negative, prevention renewed without any hesitation this time around. Glad I corrected the dry-climate thinking a few weeks back instead of waiting until something actually went wrong to figure it out. Evenings are starting to cool off a little here too but I'm not treating that as a reason to ease up either.
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Good outcome, and good instinct not treating cooler evenings as an automatic green light to relax prevention. There's a solid piece on why consistency matters regardless of temperature: https://allinpets.com/blog/dogs/heartworm-prevention-for-dogs-doses-testing-and-treatment-63/