
I can't imagine that any dog would respond well to being passed from pillar to post. A nightmare for the dog I would have thought. I also don't think it promotes responsible ownership as it suggests dogs can be taken in when convenient and then disposed of when you have had enough of dog ownership.
Having it on "trial" doesn't really give you a balanced view of dog ownership. I would imagine, and hope, that only very well trained dogs of impeccable temperament would be used and this could then give a false view. Dogs in the real world don't come ready trained and puppies are very hard work needing a lot of time, effort and commitment to become sociable, well behaved dogs.
I personally think it is an awful idea :(