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My dog had tapeworms. How long does the dewormer take to work?

Updated On September 23rd, 2025

Pet's info: Dog | Jack Russell Terrier | Female | spayed | 2 years and 10 months old | 19 lbs

My dog had a dead tapeworm in her poo on Saturday Soon as I seen it I gived her a wormer How long will it take for the wormer to work and get rid of these worms (if there is more inside her) I've not seen any more come out since just white specs in her poo but been advice by vet to give her another wormer in 3 weeks time

1 Answer

Most Helpful Answer

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Answered By Destini R. Holloway, DVM

Veterinarian

Published on December 6th, 2018

Tapeworm medication is specific, so double check to make sure that the dewormer you used was for tapeworms and not just roundworms and hookworms. It takes up to 7 days for the worms to evacuate out of her system. She can however get re-infected if she eats her own poop, continues to have a flea problem (which is where tapeworms come from) or if she eats another pets poop that has tapeworms. Tapeworms don't have to be retreated in 3 weeks b/c they just come right out and don't have a life cycle like the other worms do (hookworms and roundworms). If she had other worms, then yes she would need another treatment in 2 weeks, not 3. I hope this helps and best wishes with your pet Molly moving forward. Take care!

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