Spike is Snoopy's brother who lives alone in the California desert. Spike is first mentioned on August 4, 1975, when he sends Snoopy a letter saying that he is coming to visit. He first appeared in the strip from August 13, 1975 and has appeared in Peanuts more frequently than any other of Snoopy's siblings. Spike has whiskers which look like a mustache and always wears a hat. He is very skinny in appearance.