A dog with a crackling throat and retching may be caused by accidentally ingesting foreign objects, catching a cold, being over-excited, strenuous exercise, eating too fast, or contracting an infection. First, you need to determine whether the dog has accidentally swallowed a foreign object. If so, you need to induce vomiting immediately. If there is no foreign object swallowed, you can observe the dog and determine the specific cause based on the dog’s actual condition. If it is an infectious disease, you need to take the dog to the pet hospital for examination and treatment immediately.