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Congestive heart failure causes a cat's heart walls to thicken. As a result, blood doesn't pump efficiently, and the body doesn't get the necessary amount of oxygen. Symptoms of heart failure include shortness of breath, fever, coughing and vomiting. Causes of feline heart failure range from birth defects to parasites, according to vetinfo.com.
Congestive heart failure in cats is a condition in which the heart is unable to pump sufficient quantities of blood to the body. Normally in congestive heart failure, the heart begins working overtime to make up for its lack of efficiency and begins to enlarge as fluid accumulates in the heart. There are many different causes of congestive heart failure in cats, but the result is always the same; it eventually leads to death.