GENERAL APPEARANCE
Sizes: There are three sizes in the males and females -
Small from 25 to 40 cm ; Medium from 40 to 50 cm ; Large from 50 to 65 cm 
Weight: Small from 4 to 8 kg ; Medium from 8 to 12 kg; Large from 12 to 25 kg
Going by his general conformation, it is an elegant and slim dog, whose aspect expresses speed, strength and harmony without ever appearing coarse. There are two varieties, the hairless whose main feature is the absence of hair all over the body and the coated variety, that is entirely coated. He has a wolf like head and an alert and intelligent expression. Another particular feature is that the dentition in the hairless variety is nearly always incomplete associated with the congenital alopecia.
The eyes are slightly almond shaped and the colour can vary from black, going through all shades of brown to yellow, in harmony with the skin colour in the naked variety and with the coat in the variety with hair.  
The ears must be pricked when the dog is attentive, whereas at rest, they are laid towards the back.
CHARACTERISTICS AND CARE
This breed has, as a fundamental characteristic, the absence of hair all over the body. Another particular feature is that the dentition is nearly always incomplete. Noble and affectionate at home with those close to him, at the same time lively and alert; he is wary and a good guard in the presence of strangers.
Hairless variety: Without hair, only very few hairs on the head and at the extremities of the legs and the tail are admitted, and sometimes sparse hair on the back. These hairs can be any colour or combination of colours. Coated variety: Smooth, short and tight coat. The hair can be any colour or combination of colours.
The skin must be smooth and elastic all over the body, but can form a few rounded almost concentric lines on the head and round the eyes and the cheeks in the hairless variety. It has been verified that the internal and external temperature of the hairless dogs is exactly the same as that of other breeds (coated or not). The absence of hair leads to an immediate and direct emanation of heat, different from the coated subjects, where the heat filters through the coat by natural ventilation.
The colour of the skin in the hairless variety can vary from black, slate black, elephant black, bluish black, the whole scale of greys (diluted black), all nuances of genetic blue, dark brown going to light blond. All colours can be either uniform or show pinkish or white patches on all parts of the body. 
HISTORY
According to certain experts, this dog was introduced in Peru during the Chinese immigration, soon after the promulgation of the law abolishing the slavery of blacks by the President of Peru, Don Ramon Castilla. On the other hand, other searchers suppose that this dog comes from the African continent through the intermediary of nomads who arrived in America accompanied by their hairless dogs. Another possible explanation is that the presence of this dog would be due to the migration of men and their dogs from Asia to America through the Bering Strait. However, next to all these suppositions, there are certain proofs such as the representations which appear on ceramics of different pre-Inca civilisations (Vicus, Mochica, Chancay, Chancay under Tiahuanacoid influence, Chimu); in many cases the hairless dog has replaced the Puma, the snake or the falcon, this in particular and in a more evident way in the Chancay culture. As we can gather from the reproductions, the hairless dog appears during the pre-Inca archaeological periods, i.e. between the years 300BC and the years 1400 AC.