The Dude: What's in the f**kin' carrier?
Walter Sobchak: Huh? Oh, that's Cynthia's dog. I think it's a Pomeranian. I can't leave him home alone or he eats the furniture. I'm watching him while Cynthia and Marty Ackerman are in Hawaii.
The Dude: You brought the f**kin' Pomeranian bowling?
Walter Sobchak: What do you mean brought it bowling, Dude? I didn't rent it shoes. I'm not buying it a f**king beer. He's not taking your f**king turn, Dude.
The Dude: Man, if my f**kin' ex-wife asked me to take care of her f**kin' dog while she and her boyfriend went to Honolulu I'd tell her to go f**k herself.

more delighful quotes and a great website can be found at www.thedudeshouse.com