OATMEAL:

very good for elderly dogs having problems with their bowel movement. It contains soluble fiber which helps to regulate bowel movements in dogs. Before I continue, it is worth noting that you can only feed your dog cooked and plain oatmeal. The oatmeal must not contain sugar or any sort of flavoring.

Oatmeal is a good source of soluble fiber especially for dogs that are allergic to wheat.

It is also worth noting that oatmeal is one of those food sources you should try and confirm