Bella has done this a few weeks now she is 4 months old if she hears someone come in she doesnt know or has only seen a couple times she barks and growls and will not let them near her. She hasn't started snapping yet except for when an 8 year old tried to pick her up when she wasn't growling. She will continue to growl and bark until they leave the room while running and hiding I have been socializing her since the day I got her. At the vet she only growled at one person but she growls at everyone who comes into the house she doesn't see much. I want to try and correct this before it turns into aggression, I have tried having her relax around new people to show her they arent bad and they even try giving her treats but she won't take anything from them I asked about her siblings and they said that they aren't like this so im not sure why Bella is.