“It’s easy not to worry when you don’t have any real problems. Dogs don’t have to think about money or crime or social injustice,” says Ryan to his neighbor’s dog, Wilfred. Such is a constant theme in FX’s late-night sitcom “Wilfred:” the never-ending conflict between what Ryan (Elijah Wood) wants out of his life, and what Wilfred, whom executive producer David Zuckerman describes as “part Labrador Retriever and part Russell Crowe on a bender” wants out of it.