Rottweiler: Known for their protective nature, Rottweilers can be wary of strangers and are often reserved until they get to know someone.
Doberman Pinscher: Dobermans are loyal and protective, and they may show suspicion or aggression toward unfamiliar people.
Bullmastiff: This breed is known for its guarding instincts and can be standoffish with strangers, making them effective watchdogs.
German Shepherd: Highly protective and intelligent, German Shepherds may be reserved or cautious around people they don't know.
Akita: Akitas are known for their strong guarding instincts and can be aloof or distant with strangers.
Belgian Malinois: While highly trainable and intelligent, Belgian Malinois can be reserved or defensive around unfamiliar people.
Cane Corso: This breed is known for its protective nature and can be suspicious or guarded around new people.
Chow Chow: Chow Chows can be aloof and reserved with strangers, often requiring time to warm up to new people.