This is something taken directly from Dog Food Advisor Dot Com:
(there's more info about this on their website, btw)
Hypoallergenic dog foods usually share one of three basic designs. They are typically products made with:
- Limited ingredients
- Novel ingredients
- Hypoallergenic recipes
First, because they do contain fewer components, limited ingredientdog foods can make it easier to pin down the suspected allergen to which a pet might be allergic.
Next, novel ingredient dog foods contain components the animal might not have been previously exposed to — so, therefore, less less likely to be sensitive to.
These foods contain relatively obscure ingredients — like buffalo, pheasant, kangaroo or millet.
And finally, hypoallergenic recipes avoid the use of ingredients most likely to provoke an allergic reaction. According to an article published by Drs. Foster and Smith, they include…
Surprisingly, dogs aren’t naturally allergic to many of these items. It’s just that these are the ingredients most commonly used in dog food recipes.
So, they’re simply the ones dogs are most frequently exposed to.
And many times, it’s not even the ingredients that are the problem. Dogs can also be allergic to what’s in the ingredients, too.