Because I was a juvenile onset diabetic, I had a lot of issues and wanted to find an organization that trained or certified Medical Alert dogs. After much investigation I found several organizations that handles this. In my search I found there are thousands of people looking for service dogs. Below are some organizations who will work with you and also place dogs with you to help train them. Many of these otganizations are also looking for folks to take their dogs into their homes to help train them in socialization and such
Companion Service Dog Organization
Wolf Packs Service Dogs Organization
National Assistance Dog Training & Listing
International Association of Assistance Dogs Partners (IAADP)
Training Service Animals For The Disabled
Delta Service Dogs Organization