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"For most people, the phrase \u201Canaphylactic shock\u201D conjures up images of a life-threatening allergic reaction to a bee sting or some other trigger that causes rapid throat and bronchial constriction.  Anaphylaxsis manifests somewhat differently in dogs than it does in people, but it still is a potentially fatal medical emergency. Anaphylactic reactions in people typically affect the throat, trachea and upper airways, because the reaction normally starts in the lungs.  In dogs, anaphylaxis primarily targets the cardiovascular system and the gastrointestinal system, with respiratory signs developing secondarily. Symptoms develop almost immediately (usually within minutes) after exposure to the causative allergen.  The dog\u2019s immune system mounts an aggressive but inappropriate response to whatever the dog is allergic to, releasing \u201Cinflammatory mediators\u201D into the blood stream which in turn trigger a number of other events.  The dog\u2019s arteries and veins become stretched beyond their normal dimensions and become increasingly leaky, causing blood pressure to drop dangerously. Mucous and other secretions build up in the lungs and throat, causing respiratory distress, and the heart muscle starts pumping irregularly, in abnormal and random rhythms.  In addition, affected dogs may develop severe itchiness (called pruritis) and experience extreme pain."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Anaphylactic-Shock/Symptoms.aspx>