Don't let J.T.'s cuddly pup fool you -- tonight's competition on The Challenge: Rivals 2 is for the dogs. Literally.
After being tied together, the partners are outfitted with shock collars that emit voltage as the players get closer and closer to the end of the maze they're running.
And as you can see from ETonline's exclusive clip, the contestant with the biggest history with S&M-induced shocks has the hardest time enduring them!
The Challenge: Rivals 2 airs Wednesdays at 10 p.m. on MTV.