It is not accurate to say that dogs sticking out their tongues and panting are canine distemper, because dogs sticking out their tongues and panting are not the main symptoms of canine distemper. It may be caused by overheating, just after exercise, or excessive stress, excitement, etc. Observe whether the dog has other symptoms. If there are other abnormalities, it is best to send it to the pet hospital for examination. If there are no other abnormalities, the dog can be relieved on its own.