Canine immune system disorders range from very common (such as seasonal allergies), to extremely rare disorders that afflict certain breeds (and even, in some cases, certain branches of individual breeds). Someday, the Canine Genome Project may well bring life-saving illumination to the process by which specific genes trigger specific diseases. At present, however, the inheritance of effective immunity continues to be a mysterious, if not star-crossed, commodity. Some dogs, like some people, are unlucky. However, the immunity that any individual dog is born with can often be improved with enlightened canine husbandry practices, traditional medical care, and complementary care from holistic health modalities.