What is the most common cause of pericardial effusion in dogs?
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“Although cardiac neoplasia in dogs is rare, one survey of the Veterinary Medical Database reports that 0.19% of all canine tumors are cardiac, and these tumors are the most common cause of pericardial effusion in dogs.”
-Mark D. Olcott, DVM, and Meg Sleeper, VMD, DACVIM (cardiology)
From Recognizing and treating pericardial disease