The main symptoms of cat asthma are that during an attack, the cat stretches its neck, opens its eyes wider than normal, and some may drool, followed by a loud wheezing sound that lasts for several seconds or even minutes. . If the owner calls or touches the cat at this time, it will not show any obvious reaction. Sometimes a cough will occur and cause symptoms similar to vomiting. If it progresses, emergency situations such as shortness of breath, difficulty breathing, and even mouth breathing will occur.