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The holidays are a great excuse for people to indulge in gourmet treats if they so choose. Food that dogs are unaccustomed to can create upset stomachs, and diarrhea is almost invariably a result. Few households need a dog with diarrhea, acute or otherwise, during hectic holiday affairs. So even if you put training your puppy on hold over the holiday season, make sure she doesn't get access to too many sweet things.