Jill the raccoon was taken as a very small baby and hand raised by someone who intended to keep her as a pet. The person who had her raised her with much care and love until she was severely over domesticated and had lost all fear of humans and (worse) dogs. When she arrived at the sanctuary she was an adult and totally dependent on human care. This means that if Jill was released into the wild, she would not have the skills necessary to survive or would seek out humans and where there are humans, there are dogs.
Now Jill spends her days in our raccoon habitat with our other unreleasable raccoons. she spends her day fishing or playing or sleeping in the shade. She is learning to interact with members of her own species.