What causes pericardial effusion in dogs?
As mentioned above, a wide range of health problems can lead to pericardial effusion in a dog. One of the most common reasons behind pericardial effusion in dogs is cardiac neoplasia, i.e. abnormal and uncontrolled cell growth in the heart. The second most common reason behind pericardial effusion in dogs is heart base tumours, especially chemodectoma or ectopic thyroid carcinoma.
