Purina One Dog Food Review. border: 1px solid #CCC; Adult Shredded Blend Beef & Rice Formula contains high-quality protein, including real beef as the first ingredient. Animal feeding tests using AAFCO procedures substantiate that Pro Plan Shredded Blend Beef & Rice Formula provides complete and balanced nutrition for maintenance of adult dogs. He was healthy until the day he passed. Pet parents put in a whole lot of research into looking for the best dog food options for their pets. This gradual transition will help avoid dietary upsets. [CDATA[/* >