As for the top ten rankings of guard dogs, different rankings and judging criteria may be different. The following is a possible ranking and brief introduction:

German Shepherd: Intelligent, brave, powerful and independent, with a high degree of vigilance and keen insight, able to quickly detect potential dangers. At the same time, German Shepherds also have excellent working abilities and are capable of various guard tasks.

Rottweiler: Strong and powerful, with extremely high courage and loyalty. The Rottweiler is highly regarded as a guard dog, capable of displaying extraordinary endurance and courage in harsh environments. They are widely used for guarding and defense and make excellent family guard dogs.

Doberman Pinscher: tall, strong, courageous and aggressive, often used as a guard dog. The Doberman Pinscher is a variant of the German dog that is widely used in military, police and defense fields.

Tibetan Mastiff: Large and powerful, native to Tibet, China, it is extremely loyal to its owner and is an excellent guard dog.

Cane Corso: A large, strong dog breed, native to Italy, with excellent guarding capabilities.

Caucasian dog: It is one of the largest dog breeds in the world. It has a powerful bite and is an excellent guard hound.

Belgian Horse Dog: Very smart, brave and loyal, with excellent jumping ability and very loyal to its owner, it has also become an excellent guard dog.