Pet vs World is a series of hunter tanking, or rather pet tanking. There's a small community out there that's dedicated to tanking with their pets. I'm one of those people.

This video features the three bosses of The Spider Wing in Naxxramas(10):
Anub'rekhan
Grand Widow Faerlina
Maexxna

I've also tanked The Military Wing and parts of the Plaque Wing with my pet and off tanked Kel'Thuzad.