Site: nolo.com
... to meet Missouri's definition of a service dog include, but aren’t limited to the following:
guiding ... hearing dogs, which alert their handlers to important sounds, such as alarms, doorbells, and telephones
guide ... The state law specifically protects only:
blind or partially blind people who have guide dogs
deaf or ... need for an emotional support cat, but a landlord can't ask a blind tenant for proof of the need for a guide ...