Collapsed trachea in itself is not a painful condition, but it can cause uncontrollable coughing. In advanced cases, the narrowing of the trachea may make it hard for a dog to breathe. The constant inflammation and irritation can create additional pressure on the heart and lungs. Dogs with collapsed trachea may develop compromised lung capacity and an enlarged heart, especially if steps aren’t taken to reduce the inflammation. Most dogs with collapsed trachea will die from a secondary condition and not solely from tracheal collapse.