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Will deworming medicine harm my nursing dog's milk supply or puppies?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Female | spayed | 5 years and 3 months old | 16 lbs

Does deworming medicine affect a lactating dogs milk supply?

1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on April 29th, 2018

Some wormers can be excreted with the milk. This is not necessarily damaging to the pups, however you should read the wormer's instruction sheet before giving it to your lactating dog. It will state whether it is suitable for lactating bitches. Puppies can be wormed with puppy wormer at 2 weeks.

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