Pitbull characteristics needed for service dogs

what characteristics should I look for in a pitbull that will be suitable for service dogs training? ie therapy dog, SAR etc

 

good temperment,smarts,may want one thats not amped up all the time.

 

Low prey drive, low aggression, good off switch (can handle a lot of down time), very trainable (I think most APBT's are).
Therapy dogs are dogs that belong to a person, and do therapeutic visits to someplace such as a hospital, prison, or school. My female does therapy visits at the school where I teach, for kids w/behavior problems.
A service dog is trained to perform a task, or a variety of tasks, that help it's owner, such as a seizure alert dog, a mobility assistance dog, or a guide dog.
SAR dogs need some serious drive and focus, in order to persevere in the face of great difficulty.
All 3 need a considerable amount of training as well as good temperament.
http://www.puppyprodigies.org/
If you check out what they do w/puppies on this site, you'll see what early service dog training looks like.