Ruby and six other TDI certified Therapy dogs at Fantasy Flight, December 2004
There are a number of different pet therapy organizations in the US.

It has long been understood that animals can have a beneficial effect on the physically or mentally ill. Pet therapy organizations test animals in different situations to evaluate their responses to stress and unfamiliar environments. When a pet passes the test they are certified to perform therapy visits under the name of the certifying organization.

Therapy certifications are not titles, once a title is earned, the dog generally can not loose it. Most therapy groups require annual renewal of the certification, this includes a complete health check by a veterinarian and other requirements that vary by organization.
Pet Therapy Organizations
This is by no means an exhaustive list, but here are a few different groups to contact if you are interested in doing pet therapy. Every group has different guidelines and requirements. Please contact the individual organization for detailed testing information, age requirements and other details.

This list is the same as on the Links page. This listing is for informational purposes only and does not imply endorsement by Ruby!

DeltaSociety.org
Delta Society's Pet Partners Program trains volunteers and screens volunteers and their pets for visiting animal programs in hospitals, nursing homes, rehabilitation centers, schools and other facilities. Delta certifies many different breeds of animals for threapy work, including dogs, cats, horses, llamas, rabbits and other animals. See thier website for a complete list.

TherapyDogs.com
It is a goal of Therapy Dogs Inc. to help dog owners use their dogs for therapy work in various places such as nursing homes, hospitals and schools, as well as work with the mentally and physically handicapped.

Golden-Dogs.org
The Bright and Beautiful Therapy Dogs, Inc. is a non-profit organization which evaluates, tests, trains, qualifies and supports therapy dogs for the purpose of giving loving and empathic support in nursing homes, hospitals, psychiatric wards and other facilities where emotional service dogs are indispensable.