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dogs aren't born with allergies and therefore must be ingest or come in contact with something at least once to develop an allergy. So yes a dog can become allergic to something that has seemed fine over the years. Also as the immune system gets hit with more of the allergens it will weaken more and more, therefore giving you the symptoms you see (aka the rash). I would try the food first as that is more likely the culprit. Usually if a dog has a grass allergy they can still go on grass if you get rid of the other allergens they are in contact with (aka grain and corn) Most dogs can have allergens in their system without showing any symptoms as their immune system is healthy enough to deal with them. The more allergens the more likely you are going to see the reaction.
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Mother of MisFit.
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