Looking for a recommendation for a dog food that is high in fiber as recommended by Rocco's vet. Rocco occasionally vomits phlegm and lately has been straining after taking a solid BM. The vet suggested I find something comparable to Royal Canin Canine Gastrointestinal Fiber Response, which he sells for $63. for only 16 pounds. I found Blue Buffalo Wilderness Healthy Weight Chicken Recipe Grain-Free and Nutro Wholesome Essentials Healthy Weight Adult Lamb and Rice; both whom have had recalls and are not rated highly. I am looking for any suggestions. Thanks so much!