What is heart failure in dogs? - Animal Hospital of Statesville

Heart failure is simply when the heart fails to work appropriately. So the heart is just a big pump that pumps blood from the body back into the lungs, where it's oxygenated, and then back into the heart, where the heart pumps it back into the body, where we can use it again. And so congestive heart failure occurs when that blood does not flow appropriately.