Acute blood loss can lead to shock and even death if >30%–40% of blood is lost and the hypovolemia that develops is not treated aggressively with IV fluids or compatible blood Blood Transfusions in Animals Frequently, the need for blood transfusions is acute, as in acute hemolysis or hemorrhage; transfusions are also appropriate in treatment of acute or chronic anemias. Animals with hemostatic... read more , or both. Causes of acute loss can be known (eg, trauma, surgery) or occult (eg, GI blood loss). Coagulopathies, bleeding tumors, gastric ulceration, and external or internal parasites should be excluded as causes. GI parasites, such as Haemonchus in ruminants and hookworms in dogs, can lead to severe blood loss, especially in young animals. Low-grade, chronic blood loss eventually results in iron-deficiency anemia, although some degree of reticulocytosis may persist even after iron stores become depleted. The hallmark of an iron-deficiency anemia is microcytic, hypochromic anemia. This chronic blood loss can be due to some type of parasitism in young animals (eg, fleas, lice, intestinal parasitism), but in older animals, bleeding from GI ulcers or tumors is more common.
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Also see Pet Health content regarding blood loss anemia in dogs Blood Loss Anemia Anemia occurs when there is a decrease in the number of red blood cells, which can be measured by red blood cell count or hemoglobin concentration. It can develop from loss, destruction, or... read more , blood loss anemia in cats Blood Loss Anemia Anemia occurs when there is a decrease in the number of red blood cells. It can develop from loss, destruction, or lack of production of red blood cells. Anemia is classified as regenerative... read more , and blood loss anemia in horses Regenerative Anemias Anemia occurs when there is a decrease in the number of red blood cells, which can be measured by red blood cell count or hemoglobin concentration. It can develop from loss, destruction, or... read more .
