Once a month, 16-year-old Arizona teen Anthony Lyons checks into Phoenix Children's Hospital for chemotherapy treatment for lymphoblastic leukemia. He has three dogs of his own, but he is unable to bring them with them. Although he is visited by the hospital's therapy dogs, they can't come by every time.

So, a family friend created a Facebook events page where everybody can share pictures of their dogs and Anthony can look at them anytime he wants. Needless to say, "Photo Doggies for Anthony" has gone viral with more than 500,000 photos added and counting. And it's not just dogs, all kinds of pet photos have been added.

To add your pet's photo(s), go here.

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