Murph's Law by Susan M. Borris

As if her life wasn't chaotic enough trying to recover from a crippling car accident, Holly Wells, author of children's books, found her life completely turned upside down after a brief encounter with a woman jogger and her beautiful Golden Retriever Murphy. Ten minutes after speaking to the woman, she discovered her dead body lying in a creek and witnessed a possible murder suspect running from the scene. The problem was; he saw her and Murphy and now both their lives are in danger.