There are several organizations and trainers in Missouri that provide service dog training. Here are some options:
Canine Companions for Independence: Canine Companions for Independence is a national nonprofit organization that provides service dogs to individuals with disabilities free of charge. They have a regional training center in Kansas City, Missouri.
Pawsitive Steps Assistance Dogs: Pawsitive Steps Assistance Dogs is a nonprofit service dog training missouri organization that provides service dog training for individuals with physical disabilities, autism, and PTSD. They are located in Jefferson City, Missouri.