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My small dog is constipated. How long does Miralax take to work?

Updated on September 23, 2025

Pet's info: Dog | Shih Tzu | Male | neutered | 7 years and 5 months old | 12 lbs

My dog went to the vet for not pooping everyday. They told me to try Miralax first so I am. I gave 1/4th of teaspoon since he’s a small dog. How long does it take to see results from Miralax in a small dog? Thank you

3 Answers

Most Helpful Answer

Tomasz Wnuk

Answered By Tomasz Wnuk

Veterinarian

Published on July 19, 2020

Hello and thank you for contacting Petco Pet Education Center, formerly Petcoach. It usually takes 24-48hrs to work. If Romeo will not have gone to the toilet in the next 24hrs, you should get in touch with your vet and possibly book him in for enema.
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Related Answers from Veterinarians

  • Published on February 10, 2019

    Micralax should work straight away (or at least in 2-3 hours from administration).
    If constipation persists, I would recommend another immediate check up as abnormal dilation of the colon may be affecting him and specific medication to stimulate motility may be needed.

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    2Pet Parents found this answer helpful

  • Answered By Linda G, MS, DVM

    Veterinarian

    Published on December 10, 2018

    Hello. Generally, you give the 1/4 tsp every 12 hours until a soft, manageable stool is produced. As long as she is eating, I would give this another 48 hours to see if she produces a stool. If not, you will need to see the veterinarian for professional help & perhaps a stronger laxative. Thanks for using Petco Pet Education Center, formerly Petcoach.

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    1Pet Parents found this answer helpful

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