How long does internal deworming take to clear worms?

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After a dog takes internal deworming medicine, worms are usually passed within about 2-3 days. But if the parasite load is high, eggs may remain after the worms pass, so a second deworming is needed, generally one week later, to fully clear them. To reduce the chance of parasite disease, the owner should deworm the dog regularly and prevent reinfection.

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