What was the title of a novel that was written from a werewolf's point of view?

Long ago I read a paperback novel that was written before 1981 (I'm guessing sometimes in the 60s or 70s). The story was written from the main character's point of view who was a human male who could transform into a werewolf. When in wolf form the the author described what the wolf was feeling, such as the scent of a rabbit, a cow in heat, and the feeling of speed and power as he moved through the fields.