It is used for the qualitative detection of canine parainfluenza virus nucleic acid in relevant samples of dogs, assisting in the clinical diagnosis of canine parainfluenza virus infection. When dogs exhibit respiratory symptoms such as coughing, runny nose, fever, and rapid breathing, the detection using this test kit can help determine whether the symptoms are caused by canine parainfluenza virus infection, providing a basis for veterinarians to formulate reasonable treatment plans.