DOGS BENEFIT FROM A DIET RICH IN PROTEIN TO SUPPORT LEAN MUSCLE MASS. Your dog shares his eating anatomy with the gray wolf – which means he’s evolved for a diet rich and varied in fresh meat, protein and fat – not highly processed carbohydrates and starches. ORIJEN Fit & Trim Dog is formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles for Adult Maintenance. The grey wolf is the ancestor and closest relative of all domestic dogs. While years of breeding have produced hundreds of ‘different looking wolves’, the internal workings of wolves and dogs remain unchanged so it’s no surprise that their food requirements remain the same too. Our 5 Biologically Appropriate principles are simple and mirror the freshness and variety of meats that dogs are evolved to eat.