Alex: If you go to this web page, you can get definitions for the American Kennel Club (AKC) title suffixes (e.g., CD - companion dog, a first level obedience title) and Prefixes (e.g., CH - champion, a conformation ("show dog") title).
UKC (United Kennel Club - similar to the AKC) has titles listed under the event type (e.g., obedience -- see http://www.ukcdogs.com/rules/o-1.html; conformation -- http://www.ukcdogs.com/rules/c-3.html), etc. You have to dig a little harder to find them on the UKC site. Certified Therapy Dogs (e.g., TDI) can be found at the TDI site http://www.tdi-dog.org/. (Delta is also a therapy organization similar to Therapy Dogs International). The TDI certification is based on the AKC's Canine Good Citizen designation. A CGC is not technically a title as defined by the AKC. Hope that helps. Nancy Melone Mars, PA