The show stars Elijah Wood as Ryan, a man who meets Wilfred (Jason Gann).
The rest of the world sees Wilfred as a dog, but Ryan believes he is talking to a man in a dog costume.
Californication star Fiona Gubelmann also appears in the show and TV Line says that Klein has now signed up to play a love interest for her character. He is expected to appear in a number of episodes.
Klein starred in movies such as American Pie and We Were Soldiers and recently had a guest role in The Good Guys.