I was reading on onset aggression but it relates to dogs going into rage mode during their sleep, almost like an epileptic attack iniciates during their sleep. The growl duration is 1-2 seconds a deep growl and he stops it on its own. So far this morning he has growled twice, once when my wife was doing dishes with her back towards him he was drinking water, he proceed a growl and walked out the kitchen slowlyy wife said she couldnt see where he was focusing it to but once she saw him he looked at her walked slowly without any concerning body language. She was in the living room she told me he was laying down on the floor facing an opposite wall and growled again and stopped. This is really puzzling me, could it be jealousy of the newborn?