Welcome! I am Dr. Altman, a licensed veterinarian and happy to answer your questions today.
I apologize for the delay in response, your question is just now showing up in queue to be answered 12+ hours after your request.
To answer your question I avoid immodium at all cost because it can have quite severe consequences in some dogs, especially certain breeds.
Using a bland diet of white rice and boiled chicken
or if your veterinarian gave you a prescription gi food I would simply see if the diarrhea resolves on its own now that he has passed this object. If not, please bring in a fecal sample (fresh or refrigerated) to have your veterinarian evaluate it to ensure further medical management (anti or probiotics for example) to get him feeling better soon.
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