His Guardian Panther by Elena Kincaid

Dr. Tom Barrymore thought he was pulling over on the side of the road to help an injured man, but what he discovered wasn’t what he bargained for and he finds himself running for his life.
Sheriff and panther alpha, Luke Benson, had nearly given up hope of ever finding his mate, but when he stumbles upon him, the man is a few heartbeats away from death. He has no choice but to make a decision that will alter his mate’s life forever. He’ll do whatever it takes to convince the good doctor that they belong together, but first … there’s a matter of justice to seek against the men who dared to touch his mate, before they make another attempt.