Originating in Argentina, the Dogo Argentino (also known as Argentine Dogo or Argentinian Mastiff), a relatively young breed, is a mixture of many purebreds that were selected for their particular traits. They were first bred in the 1920s by Dr. Antonio Nores Martinez, an Argentinean surgeon, by crossing several breeds to the now-extinct Cordoba Fighting Dog, a very strong and aggressive specimen. To replace the dog's desire to fight with hunting ability, the Spanish Mastiff, Great Dane, Boxer, Dogue de Bordeaux, and several more were incorporated into the mix to produce a large, high endurance, even-tempered breed that was capable of bringing down jaguar and wild boar.
The well-muscled Dogo Argentino was bred to pursue dangerous game and possesses the qualities of strength, intelligence, and responsiveness. They have a short and smooth coat that only comes in white but a black patch near the eye is permitted as long as it does not cover more than 10% of their large head. Their medium-sized eyes, dark or hazel in color, and massive ears give them the impression of power and energy. A recognized feature of the Dogo Argentino is their cropped, erect or semi-erect ears that are triangular in shape. The muzzle is broad and houses powerful jaws with a well-pigmented black nose. The Dogo Argentino's long tail is thick at the base and carried raised in an arc with an ample curve when in action or hangs down naturally at rest.
Argentine Dogos are tough and brave, possessing great stamina. They are meant to be the most docile of the hunting dogs, yet they are reputed to possess an aggressive temperament, one of the traits that was sought for by its breeders. The breed is generally seen as not being the best suited for children and can be seen as dangerous when irritable - therefore, the Dogo Argentino is banned in some countries. However, if around children, they should be supervised. They are a fierce and determined hunter and guardian, but they can also be loving and affectionate towards the ones they love. Since they were bred to be pack hunters, they are considered to do well with other dogs, but they should be supervised. Dogos can develop territory and aggression issues towards dogs of the same sex - especially between two males. It is very important for this breed to have proper obedience training and socialization from puppyhood to avoid unwanted traits and to understand the difference between what is a threat and what is considered safe.