After looking through several hundred pictures of dog attacks. I believe the dog just got overly excited and wanted to play with the boy but was being too rough. In the photos of the boy you can see teeth marks that clearly broke skin but no tearing. In other pictures I've found of attacks the damage done to the victim was much much more severe. I believe that had the dogs intention been to hurt this boy his injuries would have been life threatening.
@Drekonix:
Really? Those injuries to his arm and leg looked like more than play to me. I am not a dog bite expert though.
If my dog did that to anyone, adult or child, unprovocted, I would have it put down.
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