I more inclined to believe the added chemicals - preservatives, colouring in commercially pack food is the root of all these evil skin conditions. Food by themselves unadulterated can't be that bad. The early domesticated dogs only feed on table scraps which is very much what they find in the garbage bins. It is already known that we humans too are bombarded by all the chemicals in our food and is detrimental to our health.

I also think hybrid vigor in the Mongrel contributes to a stronger dog. The concept of hybrid vigor assumes that a crossbred animal will be healthier than a purebred.

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