You don't need charisma to be a great leader. Be your "authentic self" as a leader in your veterinary hospital and see what happens. (Unless your authentic self is horrible, and then watch this video to fix yourself, please.)
Do you have the power to improve your associates' work life? Data from Benchmarks 2015: A Study of Well-Managed Practices (Veterinary Economics and Wutchiett Tumblin and Associates) and associates' feedback to the 2016 Firstline Career Path Study show how associates really feel about you, your practice and their work.