Normally speaking, a dog’s voice is loud. If it suddenly grunts in the middle of the night, the possible reasons are as follows: young puppies will grunt when looking for their mother at night; puppies enter a new family and environment, due to If the dog is not used to it, it will make a snoring sound in the middle of the night; if the dog is not feeling well and has low energy, it may also be accompanied by a snoring sound, which may be caused by physical illness.