A 2-year-old neutered male Jack Russell terrier dog was presented for persistent, involuntary, bilateral contractions of the hypochondriac regions of the abdominal wall that had been present for 1.5 y. Electrocardiography and fluoroscopic evaluation revealed that the contractions were synchronous with the heartbeat, consistent with a synchronous diaphragmatic flutter. Thoracic radiographs, echocardiography, and serum electrolytes did not identify an underlying cause. This case report describes a rare presentation of idiopathic, long-lasting, synchronous diaphragmatic flutter in a dog. Key clinical message: Synchronous diaphragmatic flutter is a rare condition characterized by contractions of the diaphragm that are synchronous with the heartbeat; this condition can mimic a serious cardiac or respiratory condition.
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