Third-degree atrioventricular block from metastatic poorly differentiated sarcoma suggestive of osteosarcoma in a dog

Key Points

• Third-degree atrioventricular block was observed in the dog, linked to metastatic poorly differentiated sarcoma.
• In this case, the dog's clinical signs were attributed to heart electrophysiological changes.
• Assessment involved imaging and clinical evaluation to confirm the diagnosis of osteosarcoma.
• The findings highlight the impact of underlying cancer on cardiac health in dogs.