I know of a shelter where I used to live in Colorado that would let people take the the dogs out for a day to go hiking or whatever, and come back. I think that can be a good chance for them to get out and away from the shelter while they are still up for adoption and waiting to find that forever home.

Leasing out animals for profit who have no hope of getting out of there and living in a more stable home seems really, really sad and unfair to the animals.