Mitral Valve Heart Disease
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In dogs, heart failure is usually characterized by problems with the mitral valve. This is especially true of smaller breeds, but is applicable to at least some extent with all dogs. The mitral valve refers to the muscular valve that separates the left atrium and ventricle. Its function, when working properly, is to prevent the back flow of blood once it has passed through one section of the heart to increase the efficiency of the heart's pumping, i.e. - each portion of blood that passes through the heart only needs to be pumped once because the mitral valve prevents it from flowing backwards. Over time, however, this valve begins to shrink and harden as a natural consequence of aging. [...]