Best guard dog breed for a family?

Looking for opinions on breeds that do well with children, but are naturally wary of strangers and protective of the household. I know that any dog will bark to protect its owner, but prefer the larger guardian breeds such as the GSD, Bullmastiff, and Rottweiler, etc. I'm currently in my early 20s and single,... show more Looking for opinions on breeds that do well with children, but are naturally wary of strangers and protective of the household. I know that any dog will bark to protect its owner, but prefer the larger guardian breeds such as the GSD, Bullmastiff, and Rottweiler, etc. I'm currently in my early 20s and single, but expect to have children during the dog's lifespan and would prefer to look for a breed that is known to do well with kids. At the same time, I do not like to own overly friendly and outgoing dogs such as spaniels and retrievers (although they are great dogs for the right type of person). Any suggestions would be appreciated, especially from those who have owned guardian breeds and later brought kids into the house. Thanks!
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