fight (a behavior called "unnecessary rrruff-ness"). The show uses puns to mimic the rules of professional football, including paws interference (pass interference), ruff sides (offsides), and dog-collar tackle (horse-collar tackle). Unique "penalties" called may also include howling, illegal bathing (playing in the water bowl), napping on the field, premature watering of the lawn (urination), "excessive fertilization" (defecation), "neutral bone infraction" (neutral zone infraction), and "ineligible retriever downfield" (ineligible receiver downfield). Three special "penalty calls" were introduced in 2015: "Terrorizing the ref" (for a puppy who acts aggressively toward the referee), "paws interference" (for when a puppy blocks another) and "pancaking" (for when a tired puppy sprawls on the floor instead of playing). Each year, a Most Valuable Puppy (or MVP) is chosen at the end of the show for the puppy considered to be the stand-out performer of the event. Beginning with Puppy Bowl XI, viewers were allowed to vote for the MVP. MVP voting was permitted for the program’s airing. Although puppies may urinate or defecate on the field as frequently as once every 20 seconds, all but one of the incidents is edited out of the show. In 2016, 315 plastic bags were needed to retrieve feces, and more than 1,500 absorbent pads used to clean up urination. Puppies occasionally engage in sexual activity, but this is edited out of the program. The running time of Puppy Bowls I through IV was 180 minutes (including commercials). The running time of Puppy Bowl V was decreased to 120 minutes (including commercials). Jessie Dinh, producer at Discovery Studios, explained the reason for the decrease: "We only did two hours this year so that we had the opportunity to include some other fun elements." Team Ruff vs. Team Fluff 2015's Puppy Bowl XI introduced team-based competition to Puppy Bowl for the first time. Puppies were divided into two teams, Teams "Ruff" and "Fluff", each identifiable by a different colored bandana worn throughout the event. Points were tallied on a scoreboard powered by a hamster running on a wheel. The team with the most points was declared the victor. Team Ruff overwhelmed their opponents 87–49 to become the first-ever Puppy Bowl champions. In Puppy Bowl XII, Team Ruff won again by a score of 70–44. In Puppy Bowl XIII, Team Fluff upset the heavily favored Team Ruff by a score of 93–38. In Puppy Bowl XIV, Team Fluff won again in a