I agree with the commenter who said dogs usually have a sense for danger. If someone is breaking into your home, your dog will be the first to know, and then let the household know. There’s some statistic I can’t recall exactly, but people are less likely to continue breaking into a home if a dog is barking (like a German Shepherd barking, not a Chihuahua

The temperament of your dog also largely depends on its breed. Some dogs are friendlier than others, or some are perhaps more suited for protection than others. If you want a family guardian, you’ll probably have to invest (money and time) in the breed + training for said dog.

Your pup being “too nice” isn’t a problem, it sounds like you have a happy, friendly dog for your family.