Hounded is the first book in a series called The Iron Druid Chronicles. It's yet another supernatural series with werewolves, vampires, demons, gods, witches, and so forth. But this story's hero is a druid. The last druid actually, and a pretty interesting character.
Atticus O'Sullivan, at least that's the name he uses this millenium, tries to live a quiet life in Arizona with his Irish wolfhound Oberon. But Atticus is the last druid and he's got a sword that someone else wants. Since that someone is a god it's going to be hard for Atticus to hang on to it. I really enjoyed this book and will be reading more by Hearne soon. Very highly recommended.