May or may not help the problem with anal glands. Were the stools well formed and hard on the S.Diet? Grain free foods tend to make a firmer stool therefore when passed will help to empty the anal glands.
I have never free fed… that way I know exactly what each are eating. And once you get in the habit, it is not difficult. And it really makes for better eating habits and health, IMO
And looking at the ingredients of the science diet sensitive stomach, OMG... I can't picture that helping the situation, not till the 4th ingredient do you even find a meal source. Most dogs with food issues find that it is fueled by Corn and Wheat.....
Brewers Rice, Whole Grain Corn, Corn Gluten Meal, Chicken By-Product Meal, Dried Egg Product, Animal Fat (preserved with mixed tocopherols and citric acid), Chicken Liver Flavor, Flaxseed, Lactic Acid, Soybean Oil, Oat Fiber, Dried Beet Pulp, Potassium Chloride, Dicalcium Phosphate, Iodized Salt, L-Lysine, Calcium Carbonate, Choline Chloride, Vitamin E Supplement, vitamins (L-Ascorbyl-2-Polyphosphate (source of vitamin C), Vitamin E Supplement, Niacin, Thiamine Mononitrate, Vitamin A Supplement, Calcium Pantothenate, Biotin, Vitamin B12 Supplement, Pyridoxine Hydrochloride, Riboflavin, Folic Acid, Vitamin D3 Supplement), L-Tryptophan, minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), preserved with mixed Tocopherols and Citric Acid, Phosphoric Acid, Beta-Carotene, Rosemary Extract.