Dogs suddenly keep low chirping at night

Dogs suddenly keep low barking at night, be careful if there is a stranger outside the room, this is the phenomenon of the dog in warning, usually a low growl to deter enemies. If it is more breathless low barking, it may be a physical problem, because of illness and pain and barking. Sometimes dogs find a fire, gas leak, etc. at home, because of their excellent sense of smell, they will also find it in time to alert their owners. Many puppies will keep whimpering after arriving at a new home because they have just changed to a new environment, leaving their mothers and companions, feeling strange and scared, so they will keep making whimpering sounds to pester their owners and want to be soothed.