On today's episode of Daily VICE, we meet Ivan Argelaga, a retired photographer and veteran of Spain's sadomasochist scene, who strips naked and gets down on all fours at night to play "the human dog" at Barcelona bars and art galleries. Argelaga says his extreme performance is his attempt to push limits and provoke reactions.Watch Daily VICE in the VICE channel on go90. Head to go90.com to learn more and download the app.