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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

Answered By Tomasz Wnuk
Veterinarian
Published on July 19, 2020
Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS
Veterinarian
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.
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.
1Pet Parents found this answer helpful