Season 4
Episodes
1 Big Animal Vet Jan 8, 2008 
2 Steel Mill Worker Jan 15, 2008 
3 Cave Biologist Jan 22, 2008 
4 Buoy Cleaner Jan 29, 2008 
5 Cranberry Farmer Feb 5, 2008 
6 Mud Mineral Excavator Feb 12, 2008 
7 Dirty Jobs of the Big Apple Apr 14, 2008 
8 Floating Fish Factory Apr 21, 2008 
9 Dairy Cow Midwife Apr 28, 2008 
10 Aerial Tram Greaser May 5, 2008 11 Turkey Inseminator May 12, 2008 
12 Ice Salvage Crew May 19, 2008 
13 Wind Farm Technician Jun 2, 2008 
14 Animal Barber Jun 9, 2008 15 Brown Before Green Jun 16, 2008 
16 Tar Rigger Oct 7, 2008 
17 Dirty Chip Maker Oct 14, 2008 
18 Sheep Castrator Oct 21, 2008 
19 Leech Trapper Oct 28, 2008 20 Dirty Presidents Nov 4, 2008 
21 Mannequin Factory Nov 11, 2008 
22 Egg Farm Nov 18, 2008 
23 Vellum Maker Nov 25, 2008 
24 Maggot Farmer Dec 2, 2008 
25 Gourd Maker Dec 9, 2008 26 Brown Before Green 2 Dec 16, 2008