My small dog is constipated. How long does Miralax take to work?
Updated On September 23rd, 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
Published on July 19th, 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.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on February 10th, 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
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Published on December 10th, 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
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