With access to dogs of many breeds, he got the idea to create a breed that would be ideal for protecting him. He set out to breed a new type of dog that would exhibit impressive stamina, strength, and intelligence. Five years after Dobermann's death, Otto Goeller, one of the earliest breeders, created the National Doberman Pinscher Club and is considered to have perfected the breed, breeding and refining them in the 1890s. The single exception is the documented crossing with the Greyhound and Manchester Terrier. It is also widely believed that the old German Shepherd was the single largest contributor to the Dobermann breed. Philip Greunig's The Dobermann Pinscher (1939) describes the breed's early development by Otto Goeller, who helped to establish the breed. The American Kennel Club believes the breeds utilized to develop the Dobermann Pinscher may have included the old shorthaired shepherd, Rottweiler, Black and Tan Terrier and the German Pinscher.