My dog has diarrhea after taking Lactulose. What should I do?
Updated On September 23rd, 2025
Pet's info: Dog | Shih Tzu | Male | neutered | 7 years and 6 months old | 12 lbs
My dog Romeo has consipation and was put on Lactulose. He now has mild diarrhea. What should I do besides stopping Lactulose? He’s playing and eating good. Thank you
2 Answers
Most Helpful Answer
Published on August 11th, 2020
Do not discontinue the Lactulose without the advice of the prescribing veterinarian. This may lead to constipation again. The dose and/or frequency of Lactulose will likely be adjusted by the veterinarian. In the meantime, a short fast followed by a bland diet fed in small, frequent amounts may help to resolve the diarrhea. You can discuss the use of veterinary probiotics, such as ProViable, ProStora or FortiFlora, with your veterinarian. These may promote gut health and aid in resolution of mild diarrhea as well.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on March 4th, 2017
Lactulose has a wide dose range and can certainly cause diarrhea. I typically recommend adjusting the dose so that the stool is soft but formed like soft serve ice cream. You can try decreasing the lactulose by about 25%. If she is straining at all you should see a veterinarian, because occasionally dogs who are constipated can also pass small amounts of watery stool around the firm stool that is stuck.
1Pet Parents found this answer helpful
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