Runners struggle through the waist deep and cold, muddy water during the third annual Dirty Dog Run held at Thomas College in Waterville on Sunday. More than 600 participated in the muddy obstacle course where proceeds of the event goes to the college intramural department.

Thomas College alumni Sahil Sanan, left, and David Pease wore tutus as they splashed through the muddy water during the third annual Dirty Dog Run held at Thomas College in Waterville on Sunday. More than 600 participated in the muddy obstacle course where proceeds of the event goes to the college intramural department.

Gina Rich flips heavy tires that were part of a muddy obstacle course during the third annual Dirty Dog Run held at Thomas College in Waterville on Sunday. More than 600 participated in the event where proceeds go to the college intramural department.

A runner comes into the finish line past spectators during the third annual Dirty Dog Run held at Thomas College in Waterville on Sunday. More than 600 participated in the muddy obstacle course where proceeds of the event goes to the college intramural department.

Erica Bean and other racers carry bucket loads of mud during one of the events of the third annual Dirty Dog Run held at Thomas College in Waterville on Sunday. More than 600 participated in the muddy obstacle course where proceeds of the event goes to the college intramural department.

Runners, momentarily clean and dry, are off and running at the beginning of the muddy obstacle course during the third annual Dirty Dog Run held at Thomas College in Waterville on Sunday. More than 600 participated in the event where proceeds of the go to the college intramural department.