Took Enzo in for his yearly test before renewing his prevention and the vet actually walked me through why it matters even on a dog that's never missed a dose, apparently catching a rare breakthrough case early makes a real difference in treatment options. We do a lot of trail miles together up here so I want to stay on top of anything mosquito-related given how much time he spends outside. Anyone else treat the annual test as optional, or has everyone already learned not to skip it.