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: Pets under 6–7 months old can often start prevention without a test because it takes about six months for adult worms to develop.

: Some breeds (like Collies) have the MDR1 gene mutation , making them sensitive to common ingredients like ivermectin. how to buy heartworm medicine

: Dogs with a history of seizures may need to avoid certain classes of drugs (e.g., isoxazolines). Step 3: Choose Where to Buy : Pets under 6–7 months old can often