For all dogs, Acetaminophen (Tylenol) is a deadly killer that causes seizures and death, even in small quantities. Benadryl (liquid strength) of half teaspoon or less. Kaopectate for diarrhea can be somewhat effective, but administer in small doses, and monitor the stools to make sure there is no other reason they are having the issues, including looking for worms!
ALL of it! No human medications should be given to your pet ESPECIALLY Advil, Tylenol and things of that nature. Short term, the only medication that is OK to give is Benadryl. 1mg per pound of body weight of CHILDRENS Benadryl. Short term, though. Most every human medication can and will be lethal to your dog and cat.