The Peruvian Inca Orchid — AKC name for the Peruvian Hairless Dog — is one of the most ancient dog breeds on Earth, with ceramic representations dating to 300 BC from the Mochica and Chimu cultures of coastal Peru. The AKC recognizes the breed in its Foundation Stock Service program; the Peruvian Inca Orchid Club of the United States (PIOCUS) manages the breed's US registry. "Moonflower dog" is an affectionate US community name reflecting both the breed's nocturnal historical use and the luminous appearance of the pale-skinned hairless variety under moonlight.
Three AKC sizes exist: Large (19.5-25.5 inches), Medium (15.5-19.5 inches), and Small (9.75-15.5 inches). The hairless variety carries unique management requirements — daily sun protection, seasonal clothing, and specific skin care — that distinguish it from virtually any other breed in American dog keeping. For owners who embrace those requirements, the PIO offers an utterly distinctive companion with 3,000 years of human partnership behind it.