In 1941, the Central School of Military Dog Breeding trained 485 handlers and 485 dogs for the communications service, including: 393 German Shepherds, 3 mixed breeds, 3 Laikas, 10 Doberman Pinschers, and 76 Edel Terriers. The Osovniakhim service dog breeding clubs, which supplied dogs for training, played a huge role in this.