Shrink Rap by Robert B. Parker

Boston PI Sunny Randall is the daughter Robert Parker's series hero Spenser and his inamorata, Susan Silverman, might have had if they weren't so busy parenting Pearl the Wonder Dog. Like Spenser, Sunny is smart, tough, and fearless; like Susan, she's sexy, droll, and vulnerable; and like Pearl, Sunny's pit bull, Rosie, is the only character who's wise enough to hide when trouble comes knocking at the door. In Shrink Rap, Sunny's working as a bodyguard for a famous romance writer who's being stalked by her ex-husband, a psychiatrist engaged in extremely unprofessional conduct with his female patients.