[Cassidy's Mom]

Unless you're afraid that your neighbors are going to someday break into your house and steal your stuff I wouldn't worry about her being friendly to them. Presumably YOU are friendly to them, and IMO she should readily accept people that you know and are not concerned about - neighbors, friendly strangers, people you invite into your home. A dog who is suspicious of neighbors might end up not trusting your kid's friends who come over some day. At her age especially, she should like and be friendly to people in general.

 

[Cassidy's Mom]

I get what you're saying, but puppies should be confident, friendly, and social because they have no reason to dislike or be suspicious of people. As she matures she will likely become more discriminatory about people, but right now she's way too young to be protective. Any suspicion you might see in a 4-1/2 month old puppy would more likely be fear based and indicate poor temperament, such as weak nerves.