Sirius is a 1944 science fiction novel by the British philosopher and author Olaf Stapledon, whose title character is a dog named Sirius with humanlike intelligence. A sense of existential questioning suffuses the book, as the author delves into aspects of Sirius's psyche. The novel deals with many human issues through Sirius and his experiences, his unusual nature, his ideas and his relationships with humans. The characters go to great lengths to prevent Sirius from becoming a circus-type wonderdog, and instead, they seek to develop Sirius's character much like a family would create and foster that of a human child. Plot summary Sirius is raised by scientist Thomas Trelone in North Wales, near Trawsfynydd. Thomas embarks on a program of using steroids and other chemicals to rapidly develop cognitive power of dogs, resulting in super sheep dogs. Sirius, however, proves to possess a dog intelligence comparable to a normal human being, as he is able to communicate with English words, although it takes some time for the humans to understand his canine pronunciation. He is born at the same time as his creator's human daughter, Plaxy, and the two of them are raised together as brother and sister. During childhood, Sirius and Plaxy develop an intense bond for each other. Their physical and intellectual growth become a sort of competition, with Sirius striving to equal his handed sister. But as they grew, their relationship comes under strain, as Sirius develops a dog-like sensitivity to sound leading to a unique musicality, while Plaxy had a strong visual aesthetic. Their different sensory experiences afforded less interest in each other's experience of the world. Soon it was time for Plaxy to attend primary school, but Sirius could not attend. Despite his pleas to learn, Plaxy became reluctant to share her school and social life experiences with him. Their lives drifted further apart. When Plaxy departed to attend boarding school, Thomas wanted to bring Sirius to Mr. Pugh's farm, where he would work as a "sheep-dog apprentice" before taking him to the city, believing the experience would be beneficial to his character. However, Thomas wanted Sirius to keep most of his human intelligence a secret, with Pugh only suspecting him to be a "Super-super-sheep-dog." After a period of time, Sirius became desperately lonely and longed for his family, Plaxy especially. He yearned to write to her, and after weeks of difficulty and strings of