What happens is someone (I think wolf_q is going to do it) posts a questionnaire. The questionnaire consists of stuff like your home address, first and last name, how many/what type of pets you have and so on..

Everyone who wants to participate fills out the questionnaire and sends it to the person who is going to organize it.

That person sends someone else's questionnaire to another person.

You then buy gifts for that person and their pets.