Riding High (Harlequin Blaze\Sons of Chance)

Saddle up! 

There ain't a rider that can't be thrown. And large-animal veterinarian Regan O'Connelli was thrown hard when he discovered his fiancée with his best friend. Now he's starting his life over at the Last Chance Ranch, run by the tightly knit Chance clan. But damned if his libido hasn't perked up over the spirited redhead who looks a lot like trouble…. 

Lily King is the queen of anti-structure. Turns out, that makes running a horse sanctuary a challenge. Regan's help is exactly what Lily needs—not to mention the seriously sexy sparks that are flying between them. Now she just has to convince this fallen cowboy to dust himself off and get back in the saddle…and into her bed!