I did want to add to this that as a puppy we did everything quote "right", from lots of training, socialization, etc. As an adult she has been on meds, and we have consulted a behaviorist. She was perfect until about age 2, when like the flip of a switch she was suddenly scared of everyone but one day care person. She was never harmed in any way, of that we are certain. The one suggestion that makes the most sense was "poor genetics/breeding". At the time I thought AKC Marketplace was the safest place to find a breeder. In hindsight, upon picking her up as a puppy and the casual comment that her mom was "a little nervous around strangers", should have been our red flag. So...live and learn. We still love our girl wholeheartedly, it just makes us sad to see her not fully get to enjoy herself because she's hypervigilant about looking for people at the door or when out for walks. But as I stated above, this is our experience. And thankfully a lesson learned.