When choosing a domestic guard dog, you should consider many factors such as the dog's personality, size, guarding ability, level of training, and whether it is suitable for the family environment. Here are some common dog breeds that are suitable as domestic guard dogs:

German Shepherd: The German Shepherd is a very intelligent, loyal and easy-to-train dog breed that is widely used as a police dog and military dogs.

Doberman Pinscher: Doberman Pinscher is also an excellent guard dog. They have an elegant appearance and a strong aura, and are very alert and brave.

Rottweiler: The Rottweiler is a large and powerful dog breed. , they have very high intelligence and obedience, and are very loyal to their owners and family.

Chinese Garden Dog: As a native dog breed in China, the Chinese Garden Dog has excellent housekeeping and nursing abilities. They are loyal to their owners, adaptable, and easy to raise.

In addition, breeds such as Labrador, Golden Retriever, Poodle, Pomeranian, Belgian Malinois, Samoyed and Australian Shepherd are also suitable as family guard dogs.