Complementary feed for dogs Our canned food Belcando Single Protein is available in six selected meat varieties. Single Protein cans can also be used in combination with the food supplement BELCANDO Mix it GF for diagnosis elimination diet and sustained feeding for food intolerances. Also ideal as a source of protein in elimination diets. Single Protein can be used for long term feeding for food intolerances - again in combination with Mix it GF.