When choosing a guard dog, there is no absolute "best" breed because each dog has its own unique personality, abilities, and way of adapting to its environment. However, there are some dog breeds that are widely regarded as excellent guard dogs because of their natural alertness, loyalty, and bravery. Here are some common breeds of excellent guard dogs:

1. German Shepherd: German Shepherd Dogs are known as the king of dogs. They are smart, loyal, brave and easy to train. They are very loyal to their families and have a strong sense of territory. They are good guard dogs.

2. Doberman Pinscher: Doberman Pinscher is a highly alert dog breed. They are agile and tenacious. They are not only loyal to the scavenger, but also good at tracking and searching. They are the guardians of homes and homes. right-hand man.

3. Rottweiler: The Rottweiler is a strong and powerful dog. It has good obedience after training and is very aggressive towards intruders. It is an excellent watchdog.

4. Cane Corso: Cane Corso is mature and calm, brave and serious, and full of male hormones. As a guard dog, it has extraordinary fighting ability. Be alert to every move around you.

In addition, Chinese garden dogs (local dogs) are also common guard dogs in our country. They have a calm personality and are highly alert to the things around them, making them very suitable for guarding homes and nursing homes.