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The Chihuahua is one of the smallest breeds of dog, and is named after the Mexican state of Chihuahua. They are the smallest breed recognized by some kennel clubs. The Chihuahua has some predisposition to several neurological diseases, among them atlantoaxial instability, ceroid lipofuscinosis, congenital deafness, congenital hydrocephalus, muscular dystrophy, necrotizing meningoencephalitis, and neuroaxonal dystrophy. Chihuahuas may suffer from patellar luxation. Their lifespan is between 12–15 years, but it is possible for them to live past 20.