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Protein Source
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Game-based proteins, such as duck, bison or venison, are the least allergenic, as these animals are generally not raised on a diet with wheat, corn or soy, which are common allergens for many dogs.
Fillers
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Carbohydrate fillers in commercial dog food least likely to cause an allergic reaction include rice, sweet potatoes or peas.
Omega-3
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Omega-3 has proved beneficial for the health of a dog's skin, offering relief from allergic reactions. 1000 mg daily is recommended for a medium-size dog.
Fresh Food
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Many pet owners have found relief by feeding their dogs fresh food such as eggs, liver and cottage cheese. Dogs should never have onions, macadamia nuts or grapes/raisins, as these foods are dangerous to their health.
Raw Food
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Some owners feed their pet a diet of completely raw food, just as an undomesticated canine (like the wolf or coyote) would have. A diet of uncooked meat and bones could strengthen the dog's immune system.
Diet Change and Relief
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Usually a dog will show signs of improvement after six to eight weeks on a new diet.
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The Best Dog Food for Skin Allergies
A food allergy is one of the itchiest conditions a dog can have, leading to infection, loss of hair and open wounds. Proteins, fillers and colorings react with the dog's immune system, manifesting as an inflammation of the skin. A change in diet may offer some relief.