They do also love to live with another dog of similar temperament. (lovethatpet.com)
These breeds have a similar appearance and very similar temperament and behavior. (dogbreedstandards.com)
Both seem to have similar temperaments in many respects, however, the German Shepherd can become a bit nippy and bark at you when he's left alone too long or doesn't get enough attention or stimulation. (animalso.com)