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When should I give my dog a second wormer dose for hatching worms?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 30 lbs

If a dog has a bad case of worms & was given a wormer today, when can a 2nd dose be given to catch any that are hatching in the dogs system?

1 Answer

Most Helpful Answer

Andrea M. Brodie, DVM

Answered By Andrea M. Brodie, DVM

Veterinarian

Published on July 19th, 2018

The best time to give a second dose is approximately 20 days after the first dose. This should hit the worms that hatch from eggs remaining but before they can lay new eggs. If Brownie had such a severe case of worm infection, you may want to collect a fresh fecal sample about 3-4 days after the second dose of wormer and take that to your vet for a fecal exam. This sample should be clear.
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