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"Within red blood cells is a protein called \u201Chemoglobin,\u201D which functions to transport molecular oxygen in the blood to all body tissues.  Normally, as red blood cells age or are damaged, they are broken down by other cells, called \u201Cmacrophages.\u201D  Part of the hemoglobin molecule is recycled to the bone marrow to be incorporated into new red blood cells (also called erythrocytes or RBCs).  Other parts of the old or damaged RBCs are processed and excreted by the liver.  When dogs have an abnormally low red blood cell mass \u2013 and therefore an abnormally low amount of hemoglobin available to carry oxygen throughout their bodies \u2013 they basically experience varying degrees of oxygen starvation.  The consequences of anemia can be mild or life-threatening, depending on its cause and the ability of the dog\u2019s body to regenerate and maintain a healthy red blood cell level."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Anemia/Symptoms.aspx>