Which requirements should feed for dogs suffering from allergies fulfil?

1. In order to provide a low-allergen and immune-system friendly feed foundation for dogs suffering from allergies, it has to be guaranteed that the feed does not contain any:
- synthetic additives such as preservatives, attractants, fragrances and flavourings as well as antioxidants such as BHT, BHA or ethoxyquin
- synthetic vitamins
- inferior proteins or risk material
- inferior vegetable by-products
- soya and soya by-products, etc.

2. In order to prevent a lasting irritation of the immune system and to avoid pathogen overdoses, moderate contents of the following must be contained:
- crude protein
- crude fat
- crude ash
- calcium and other minerals