I suspect, though haven't tested the theory, that he may be sensitive to the grains in the formula.
Wellness Super5 Mix Lamb/Barley Ingredients:
Lamb, Menhaden Fish Meal, Oatmeal, Ground Barley, Ground Brown Rice, Rye Flour, Tomato Pomace, Canola Oil (preserved with mixed tocopherols, a natural source of Vitamin E), Salmon Meal, Rice Bran, Tomatoes, Ground Millet, Natural Lamb Flavor, Ground Flaxseed, Carrots, Spinach, Sweet Potatoes, Apples, Blueberries, Dicalcium Phosphate, Calcium Carbonate, Potassium Chloride, Minerals [Zinc Sulfate, Zinc Proteinate, Iron Proteinate, Ferrous Sulfate, Copper Proteinate, Copper Sulfate, Manganese Proteinate, Manganese Sulfate, Sodium Selenite], Vitamins [Beta-Carotene, Vitamin E Supplement, Ascorbic Acid (Vitamin C), Vitamin A Supplement, Niacin, Calcium Pantothenate, Riboflavin, Vitamin D-3 Supplement, Pyridoxine Hydrochloride, Thiamine Mononitrate, Folic Acid, Biotin, Vitamin B-12 Supplement], Choline Chloride, Taurine, Mixed Tocopherols (a natural preservative), Glucosamine Hydrochloride, Chondroitin Sulfate, Chicory Root Extract, Garlic, Yucca Schidigera Extract, Green Tea Extract, Dried Lactobacillus plantarum, Enterococcus faecium, Lactobacillus casei, Lactobacillus acidophilus fermentation products.
Vander is now switched (cold turkey) to Taste of the Wild High Prairie
Bison, lamb meal, chicken meal, egg product, sweet potatoes, peas, potatoes, canola oil, roasted bison, roasted venison, natural flavor, tomato pomace, ocean fish meal, salt, choline chloride, dried chicory root, tomatoes, blueberries, raspberries, yucca schidigera extract, dried fermentation products of Enterococcus faecium, Lactobacillus acidophilus, Lactobacillus casei and Lactobacillus plantarum, dried Trichoderma longibrachiatum fermentation extract, vitamin E supplement, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, copper sulfate, potassium iodide, thiamine mononitrate (vitamin B1), manganese proteinate, manganous oxide, ascorbic acid, vitamin A supplement, biotin, niacin, calcium pantothenate, manganese sulfate, sodium selenite, pyridoxine hydrochloride (vitamin B6), vitamin B12 supplement, riboflavin (vitamin B2), vitamin D supplement, folic acid.
We switched him from EVO for three reasons -
2. TOTW is more cost efficient for a dog his size, and easier to obtain should he be adopted.