Dogs grunting all the time may be scared at night and need to be soothed by their owners; they may also be hungry and grunting for food from their owners; they will grunt when they want their owners to play with them more; if they are sick, they will also grunt because of pain. In general, dogs will be afraid when they hear the sound of firecrackers or thunder. But dogs can not speak, so they will express fear by grunting. This time the owner should hold the dog and soothe the dog.
