Chihuahua is a carnivorous mammal in the family Canidae, also known as a teacup dog, Chihuahua dog, etc. Chihuahuas are widely distributed around the world. Intelligent, lively, clingy, vigilant in action, with a tenacious will, very brave, and even possessing certain hunting abilities. Chihuahuas are the world's smallest pet dog breed and one of the oldest breeds in the world. As early as the era of the Inca Empire, it was the inviolable dog of the Holy Spirit in people's minds at that time. In 1923, the Chihuahua Dog Club was established in Mexico; The dog club was established in the UK in 1949.

The Doberman Inu is a carnivorous mammal belonging to the family Canidae and genus Canis. Doberman Inu, also known as Doberman Inu. The Doberman Inu was named after Mr. Louis Doberman, who cultivated this breed, to ensure its safety during missions. The Doberman Inu is native to Germany and has a lively, alert, firm, agile, brave, loyal, and obedient personality; Suitable for urban living, heat-resistant and cold resistant, does not require frequent grooming, easy to train, but not easy to get along with other dogs. Its absolute obedience to its owner is destined to make this breed of dog a natural "soldier", the best "border guard", and the first choice for border guards to carry out tasks

The German Shepherd is a medium-sized dog breed originating from Germany, also known as the Alsace Wolf Dog, German Wolf Dog, German Shepherd, etc. German Shepherd Dogs are a comprehensive product of crossbreeding various excellent breeds from North and South Germany. They are agile, intelligent, and easy to train, suitable for various complex working environments. They are often deployed to participate in different tasks. During the First World War, it served as a military dog accompanying the army and made great military achievements. During peacetime, German Shepherds were also active worldwide as military police dogs, search and rescue dogs, guide dogs, and domestic pet dogs. The German Shepherd has become one of the most widely distributed and popular dog breeds.

The German Shepherd is a medium-sized dog breed originating from Germany, also known as the Alsace Wolf Dog, German Wolf Dog, German Shepherd, etc. German Shepherd Dogs are a comprehensive product of crossbreeding various excellent breeds from North and South Germany. They are agile, intelligent, and easy to train, suitable for various complex working environments. They are often deployed to participate in different tasks. During the First World War, it served as a military dog accompanying the army and made great military achievements. During peacetime, German Shepherds were also active worldwide as military police dogs, search and rescue dogs, guide dogs, and domestic pet dogs. The German Shepherd has become one of the most widely distributed and popular dog breeds.

The Doberman Inu is a carnivorous mammal belonging to the family Canidae and genus Canis. Doberman Inu, also known as Doberman Inu. The Doberman Inu was named after Mr. Louis Doberman, who cultivated this breed, to ensure its safety during missions. The Doberman Inu is native to Germany and has a lively, alert, firm, agile, brave, loyal, and obedient personality; Suitable for urban living, heat-resistant and cold resistant, does not require frequent grooming, easy to train, but not easy to get along with other dogs. Its absolute obedience to its owner determines that this breed of dog is a natural "soldier", the best "border guard", and the first choice for border guards to carry out tasks.

The Labrador Retriever is a breed of hunting dog that originated in Newfoundland, Canada, and was first trained to retrieve fishing nets and carry them on cold seas. Labrador Retrievers have a very high IQ, they are intelligent, obedient, easy to train, obedient to commands, and very gentle towards both the elderly and children. After training, it can serve as an important helper for humans, such as a guide dog for the blind, an assistance dog for the disabled, or a guard dog to assist in detecting drugs, explosives, and so on.