Gun Shy by Diane Saxon

The subject of his grandmother’s enthusiasm to marry him off, Sheriff Jack T Swann is fighting dirty to save his skin and has sworn off women until further notice. So the very last thing he needs in his life is a beautiful damsel in distress. Despite initial appearances, Jack soon discovers Kate is anything but distressed. In fact, she’s more than capable of skewering him with her kitten heel.
Doctor Kate Marsden is handy with a scalpel, but she’s not quite sure how to deal with the local sheriff, who she inadvertently mistakes for a pervert while trying to report a crime.
Time and again their paths cross and attraction rages between them, but while Jack is adamant he’s not in the market for a serious relationship, Kate is definitely not interested in a one-night stand.