"Dogs act like they have have the mythical "cast- iron stomach" most times, eating objects and substances that make us shudder in disgust. And while it's true that dogs can consume these
things blithely, it's also true that a sudden change of a dog's primary diet can be hard on both their stomachs and their eating habits. Changing the main ingredient of your dog's diet (e.g: brand of dry dog food) should be done gradually and over a period of at least four days (preferably longer).On Presenting Your Dog With a Menu of Many Choices I'm not talking about raw feeding here, and I'm not discussing home cooked meals. This refers to a habit some dog owners have developed of having an array of dry dog food choices, or of buying whatever is on sale that week to the feed the dog and save money. Here's a little tip: It may save you a few dollars, and it may be convenient for you, but you are hurting your dog. Chronic indigestion, finicky eating habits, and chronic diarrhea are just three common things that will happen if you like to switch your dog's foods constantly."

"Remember, keeping a consistent diet for your dog is crucial for them to live a happy and healthy life. Often time's individuals will change their dog's food frequently, possibly purchasing which ever brand is on sale. DO NOT DO THIS! By changing your dog's food consistently you will be causing things like indigestion, finicky eating habits and chronic diarrhea. You would not want that to happen to you, why would you do that to your dog?