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Breathing problems in Chihuahuas can be caused by pulmonic stenosis or tracheal collapse, which may be hereditary or caused by injury. Symptoms include difficulty breathing, coughing, fatigue, and irregular heartbeat. A vet can diagnose the problem using physical exams and diagnostic tools. Surgery is usually required to treat the conditions, although supportive therapy may help in milder cases. To prevent tracheal collapse, owners should use a soft body harness instead of a collar and avoid yanking or pulling on the leash. Additionally, researching the health history of the dog's ancestors before buying a pup can help prevent pulmonic stenosis.

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