Hi Laura:
I like and regularly feed Wellness kibbles/canned and Holistic canned to both my dog and cats. I haven’t tried the Holistic kibbles, but they are on my list to try.
I would look into feeding different proteins and carbs, but more importantly I would begin keeping a list of all the proteins and carbs in his diet. IMO if it is a food allergy or sensitivity saving the ingredient lists from each food (including treats and canned foods) and comparing these lists in order to find the offending ingredient(s) is the best approach; it is also time consuming.
There are quite a few fish based kibbles. I found three that fall under my specific criterion without potatoes of any kind, but two of them have high calcium and phosphorous ratios and of these two one has low nutrient levels. I decided not to consider them after looking at their websites and reading comments about the companies on DFA. The third is Blackwood Large Breed Adult Dog Whitefish Meal & Oatmeal Recipe, however it also includes duck meal.
This list may or may not be what you are looking for; none contain salmon, most contain sweet potatoes, some have flax seed, and some have fish you haven’t fed. Review the recipes carefully, they may include ingredients that you are trying to avoid:
• Blackwood Large Breed Adult Dog Whitefish Meal & Oatmeal Recipe – potato free, includes duck meal
• Pioneer Naturals Grain Free Whitefish
• by Nature Ocean Whitefish & Green Peas Recipe
• Wellness Complete Health Adult Whitefish & Sweet Potato
• Wild Calling Whitefish recipe
Here’s a link to carb values for Wellness kibbles:
/forums/topic/carb-values-of-wellness-kibble/#post-54314
Here’s some links to articles about allergies/food sensitivities in dogs:
http://www.dogsnaturallymagazine.com/grain-free-dog-foods-solving-yeast-and-skin-issues/
http://pets.webmd.com/dogs/guide/caring-for-a-dog-that-has-food-allergies
http://vetmed.tamu.edu/news/pet-talk/itchy-dogs-%E2%80%93-is-food-the-problem#.VDbE_LnQOpo
http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=2499
