In 1949, Menzel founded The Institute for Orientation and Mobility of the Blind, and in 1953, she started to train Canaan dogs as guide dogs for the blind. Although she was able to train several dogs, she found that the breed was too independent and too small for general guide dog use, although some of her dogs were used successfully by children. Her breeding program was concentrated with the Institute, where a foundation of kennel-raised Canaan dogs was established, carrying the name 'B'nei Habitachon'. In addition, a controlled collection of dogs of the original type was continued, primarily from the Bedouin of the Negev. She later supplied breeding stock to Shaar Hagai Kennels which continued in the breeding of the Canaan dog.