Patent Ductus Arteriosus in Dogs: Welfare Guide

Key Facts

• The ductus arteriosus should close within hours to days of birth — failure causes abnormal shunting
• A continuous machinery murmur at the left heart base is the hallmark clinical sign
• Poodles, Maltese, Pomeranians and German Shepherds have the highest breed prevalence
• Transcatheter occlusion (minimally invasive catheter closure) is now the preferred treatment
• Success rate for catheter closure exceeds 95% with rapid return to normal cardiac function

Welfare Considerations

Untreated PDA progressively overwhelms the left heart, causing pulmonary hypertension, congestive heart failure and death, often before 2 years of age. Welfare impacts are severe in advanced cases: respiratory distress, exercise intolerance, coughing and collapse. However, when diagnosed and corrected early — ideally before 6 months — dogs live completely normal lives. The minimally invasive catheter approach reduces surgical trauma significantly compared to thoracotomy.

What You Can Do

• Have your puppy screened for heart murmurs at first vaccination — early detection is key
• Seek referral to a veterinary cardiologist promptly if a murmur is identified
• Choose minimally invasive catheter occlusion over open-chest surgery when available
• Restrict exercise until surgical correction has been performed and cardiac function confirmed normal
• Breed dogs only after confirming freedom from PDA — it has a heritable component in some breeds