Dr. O’Halloran grew up on Long Island riding at the Thomas School of Horsemanship. He later worked at Belmont Park, grooming racehorses for Rokeby Stables. In 1978, Pete completed the horseshoeing training course at Cornell. He went on to shoe polo horses in Florida, New York, Connecticut and Massachusetts, before returning to school and completing his doctorate of veterinary medicine from the University of Florida in 1992. Initially after vet school, Dr. O’Halloran practiced on the thoroughbred racetracks of south Florida before moving to Maryland and joining Monocacy Equine Veterinary Associates in 1995.
In 1999, Dr. O’Halloran joined Dr. Forfa as a part owner of Monocacy Equine. He lives in Dickerson, Maryland where he helped raise his two boys and enjoys horses with his wife Sarah. Contact Dr. O’Halloran at contactus@monocacyequine.com
Alisha Bretz, DVM
Dr. Bretz grew up in Asheville, NC spending every moment she could on a horse. It was there her love of horses and desire to become a veterinarian was formed. She spent four years at Averett University in Danville, VA, earning a B.S. in Biomedical Sciences with a minor in Equestrian Studies. She also actively participated on the eventing team, successfully showing throughout North Carolina and Virginia. During this time, she cultivated an understanding of proper conditioning of the equine athlete. Vet school brought her to the Virginia Maryland College of Veterinary Medicine in Blacksburg, VA where she graduated in 2009 with an Equine emphasis. Dr. Bretz practiced for nine years in southern and then northern Virginia before joining Monocacy Equine. Her primary areas of interest are diagnosis and rehabilitation of lameness and other medical conditions of the sport horse. She has spent countless hours working to improve her diagnostic imaging skills and staying relevant on current treatments for lameness as well as other maladies of the sport horse. She takes pride in working to rehabilitate and strengthen the whole horse to avoid future injury after layup. When she isn’t practicing, you can find her hiking, running, rock climbing, cooking or riding. Dr. Bretz is truly passionate about spending time outdoors. Contact Dr. Bretz at contactus@monocacyequine.com
Mary Davis, DVM, CVMMP
Dr. Davis grew up in Columbia, MD, learning to ride at the Columbia Horse Center. She spent time there as a working student and rode along with the veterinarians at Ridgeview Equine. She earned her B.S. in Animal and Poultry Sciences at Virginia Tech where she was a founding member of the Eventing Club and participated in nutrition research. She graduated from Tufts University in Grafton, MA in 2019 with her DVM. During her time in school she spent a lot of time with the Large Animal ultrasound department where she developed and interest in sports medicine. She was awarded the Large Animal ultrasound student of the year award her final year of school. After school, Dr. Davis completed an internship and continued as an associate with Unionville Equine Associates in Oxford, PA before joining Monocacy Equine. Her primary area of interest are internal medicine, diagnostic imaging and alternative therapies such as chiropractic and acupuncture, where she has a growing clientele. Over the past several years, Dr. Davis has pursued continued education and certifications in chiropractic (equine spinal manipulation) and acupuncture therapies. When she isn’t practicing you can find her riding her horse Hogan, baking, or hiking with her dog Hazel.
Maddie Stevens DVM, CVA
Dr. Maddie Stevens is a North Carolina native who’s had a lifelong passion for horses and the horse industry. She was an avid 4-Her growing up and still owns the Quarter Horse she got at 10 years old. After earning her B.S. in Animal Science with a minor in spanish from North Carolina State University, Dr. Stevens worked as a technician at PetersonSmith Equine Hospital in Florida where she gained an abundance of veterinary experience. She returned to North Carolina to complete her DVM at North Carolina State College of Veterinary Medicine. In vet school she focused heavily on equine medicine and pursued many extra equine education and outreach opportunities. Dr. Stevens completed a rotating internship at Oklahoma City Equine Clinic and is a Certified Veterinary Acupuncturist. Outside of work, she enjoys three day eventing and a variety of outdoor activities with her husband. They have 2 cats and Dr. Stevens will admit to being a bit of a crazy cat lady. She loves all aspects of equine practice and is looking forward to developing a relationship with you and your horses.
Lauren Obermeyer DVM
Dr. Obermeyer is a Cincinnati, Ohio native where she grew up spending every possible minute in the barn, working during the summers as a trail guide and working student. She attended The University of Findlay where she rode on the hunt seat IHSA team and earned dual degrees in Animal and Equine Sciences. Her time at Findlay founded a love for teaching, and working as a show groom. She spent many nights braiding hunters and jumpers to support her own horse showing aspirations. She attended veterinary school at The Ohio State University and graduated with her DVM in 2025. While at OSU Dr. Obermeyer took particular interest in lameness, imaging, surgery, and emergency cases and was awarded the ACVS Award for Excellence in Large Animal Surgery. Outside of school she furthered her love for the sport horse, working alongside veterinarians at the World Equestrian Center and Kentucky Horse Park. Following veterinary school, she completed a year-long internship with Blue Ridge Equine in central Virginia, where she furthered her skills in both hospital and field settings. When she’s not in the truck, you can find her spending time with her senior gelding Ace, reading a good book, hiking, or curled up with her two cats Lulu and Missy.
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