Hello,I would love to help I just have a few additional questions. After your reply please allow a few minutes for me to type your answer.
Was it only one tablet?
This is used inn dogs to help with constipation and one tablet will not have any major effects. You may see some diarrhea but it will not effect the internal organs so there is no cause for concern.
Here is additional information
If he does get diarrhea I would just feed a bland diet of boiled chicken and rice for one day and it should resolve on its own.
I hope this helps ease your mind. Please reply back if you have additional question or concerns