There is an Exotic Feline Rescue Center in Center Point, Indiana. They have about 200 large and Exotic Felines {Lions, Tigers, Cougars, etc.)

Some of the dirty parts of the job are:
-butchering dead cows and horses to feed the large cats
-Cleaning the pens
-being sprayed by teritorial males
-cleaning wounds, infections, etc.
-etc.

http://exoticfelinerescuecenter.org/home.html

My father took me there and I was amazed at the dedication of the mostly volunteer staff to these animals. I could not believe some of the things they were enduring to make sure this animals got proper care. I think it would be an excellent additon to a dirty jobs episode.

The center is located in a agricultural area and they offer a free service to farmers...if the farmers have any livestock or large animal deaths the center will drive out and pick up these dead animals to buctcher and feed to the lions. They use a forklift to hang the dead animals and carve them into portions with saws and knives. We were lucky enough to catch them carving a whole cow and it was pretty dang dirty and smelly!