Many people said that they lost their pets in the past for some reasons.
My friends told me about some one lost their dogs in the trip. How sad.
I think we shall do our best for the pets and may make pet tags for the pets. In that way, people can call you if someone found your pet.
Today I found some cool pet tags site and here is the nice one you may like to see it too, but there are ton of the sites on the net: *LINK REMOVED BY MODERATOR*
Best wishes!