That's a sick Mexican named Aaron Pino from Tecate, Baja California, aiming to shock. Claims he found the dog already dead in a river.
http://voces.huffingtonpost.com/2013/08/20/aaron-pino-perro-crucificado_n_3787799.html
Which is a shame. I'd really love to blame it on the Moon God worshipers!
Dang.....found it mistitled on the internet. Thanks for the info.