Kihara Noukan

Kihara Noukan (木原 脳幹) is a character introduced in Shinyaku Toaru Majutsu no Index. He is a member of the Kihara Family, first referred to by Kihara Byouri in Baggage City. He is a golden retriever  with arithmetic circuits externally attached to him. Despite being a dog, he is capable of human speech, and has a man's voice. Also, he is said to be the most influential Kihara in many different fields.