1. MORE COMPLETE NUTRITION
You'll notice a lot of pet foods on store shelves touting that they are a "complete and balanced" diet. Although a number of different ingredients contain the same vitamins, minerals, and nutrients, they don't contain the same level of those things.
For instance, beef and salmon are both great sources of protein. Beef contains much more iron than salmon and is lower in cholesterol, while salmon contains more Omega-3 fatty acids than beef and is lower in fat. By rotating through a number of ingredients in your dog's food each week or each month, he's more likely to get a better balance of nutrients.
2. MEALTIME BECOMES EXCITING
If you've ever dealt with a "picky eater" you know how frustrating it can be. Picky eating can result from certain health issues, but it can also just be a harmless though annoying personality trait of a semi-privileged dog who has had better food and won’t be satisfied with anything less.
By rotating your pup's proteins, he not only gets different flavors, but different textures as well. It's like a brand new experience is waiting for them every time they run to their bowl.