Can I give my dog imodium for diarrhea?

Diarrhea is a sign that something isnt right and giving anything to stop the symptoms can mask other things. If the dog has diarrhea and any other symptoms like vomiting, acting lethargic, I strongly suggest consulting a vet asap since it could be a number of things, some not so serious, some very serious. If no other symptoms are present, I stop feeding until the diarrhea stops and then start with a small amount of cooked rice. If that does not produce more diarrhea, I give a bit more rice with some cooked chicken or ground beef. If the diarrhea stops, I start mixing in the dog's regular food. Always make sure the dog has plenty of water and is drinking it.

If however the diarrhea persists, I go to the vet with a stool sample.

yes, immodium is ok to give your dog, Slippery elm is a more natural and gentle remedy though. As for food, cooked white rice with boiled chicken and a lot of water or broth to keep him hydrated