Potatoes, as well as wheat and grain derivatives, can be indigestible to the digestive system of carnivores. Potato Free foods are rich in highly assimilable protein and free of flour or freeze-dried potatoes.
In the wild, dogs and cats would not eat potatoes as frequently as we have accustomed them to industrial kibble. Potatoes are very much use in recipes for Pets because they increase the protein value of recipes without impacting the production price (if you increased amount of meat choice, it would go up a lot of piece). At the same time, more and more dogs and cats, are beginning to develop intolerances to potatoes, precisely because their digestive systems are 'saturated' with non-animal proteins.
Choosing Potato Free foods helps the animal to digest properly, not to mention the benefits that can be found such as coat strength, coat shine, and regularity.