Always There by Lauren Brooke
Even at graduation, Amy cannot concentrate on her accomplishments. She is distracted by her concern for a sick horse back at Heartland. College is weeks away, but she dreads having to leave her home and her work at the stable - the work she took over after her mother's death. It doesn't help that Lou, Joni, and Ty - her boyfriend - are already making decisions without her, anticipating life after she is away at school. When a new horse arrives for treatment, everyone seems wary of telling Amy his story. As she starts to treat him, his fear seems a mystery.