I can only link to this 13 minute TVNZ video — Prison pups:

Mobility dogs in training. Still from TVNZ video.

Some of New Zealand’s worst criminals are finding unconditional
love behind bars: meet the prison puppies said to be helping both
society and cell mates.

A group of women in prison in Auckland, New Zealand, have been specially chosen to provide initial training for mobility dogs, as part of the work of the Mobility Assistance Dogs Trust:

The MISSION of the Trust is to “enhance the lives of people living with long term physical disabilities by providing trained mobility dogs to increase independence, confidence, self esteem and participation in New Zealand communities”

The women find friendship and purpose in their training work. With plenty of time at their disposal, they can provide a commitment that may be hard to find elsewhere.

It seems like a perfect partnership: training the puppies brings benefits for prison inmates; the trained dogs bring benefit for people with disabilities.