Our Veterinarians




  • Dr. Rachel Busato

    Rachel grew up in the Stouffville area before attending the University of Guelph and graduating in 2007 from Ontario Veterinary College. She worked in a mixed animal practice in the Kawartha Lakes area for a year before coming to work here at Port Perry Veterinary Services. In 2012, Rachel joined on as a practice owner. Rachel's professional interests include equine reproduction, lameness, and chiropractic. She also enjoys emergency cases involving horses, cattle and small ruminants. For fun, Rachel enjoys playing hockey, baseball and horseback riding.




  • Dr. Harry Morrison

    Harry graduated from the Ontario Veterinary College in 1971. He then joined Brooklin Veterinary Hospital practicing large animal medicine. In 1972, Harry bought into the practice and became partners with Bob McCrae. Harry and his wife Sherri have 2 sons and live on a farm with horses, and raise Old English game birds, peacocks, racing homer pigeons and competition tipplers.




  • Dr. Allison Doherty

    Allison grew up locally in Brooklin. Before vet school, Allison spent her time working with racehorses and competing with her mare, Teddy. She graduated in 2011 from the Ontario Veterinary College in Guelph. She has worked at PPVS since graduation, and joined on as an owner in 2016. Allison enjoys working with all large animals, but she particularly enjoys equine dentistry, primary health care and emergency work. Allison lives in Port Perry with her family and a collection of animals. Besides horseback riding, Allison enjoys gardening, baking, snowboarding and playing hockey in her free time.




  • Dr. Erin Branigan

    Erin grew up in Cambridge, ON as well as overseas in Indonesia. She graduated from the Ontario Veterinary College with a Doctor of Veterinary Medicine in 2015. Prior to veterinary school, Erin evented up to the preliminary level competing in both the US and Canada. Since graduating, Erin has spent a year completing an internship at an equine clinic and referral centre in Wisconsin where she has further developed her passion for sports medicine and lameness. When not working with horses, she enjoys spending time with friends and family, getting outdoors, playing sports of all kinds and travelling.

  • Dr. Brittany Greenwood



    Dr. Brittany Greenwood

    Dr. Brittany Greenwood joined the Port Perry Veterinary team in 2019, bringing her experience and passion for quality medicine along with her. Brittany is an Ontario native, born and raised in the Greater Toronto Area. She is an honours graduate of the University of Guelph and Ontario Veterinary College, where she received the R. A. Curtis Award for excellence and passion for bovine medicine in 2015. Her experience includes exclusive large animal veterinary service in eastern Ontario and the Golden Horseshoe, and has a passion for health management of both cattle and small ruminant herds, reproduction medicine, and individualized equine medicine. Brittany’s ongoing position as a meat inspector provides us with added experience in pathology, welfare, and infectious disease. Brittany has also previously worked at small ruminant and dairy farms in the Guelph area, researched ketosis, bovine reproduction, and poultry health at the University of Guelph, as well as calf health at various farms in southwestern Ontario. Brittany lives with her husband, Chris, who is also a veterinarian. Together, they have settled in the Brooklin area with their menagerie of animals. Outside of work, Brittany loves spending time with her family and friends and enjoys exercise, travelling, dance, and expressing her creativity through art.




  • Dr. Robert McCrae

    After graduating in 1967 from the Ontario Veterinary College in Guelph, Bob joined Brooklin Veterinary Hospital, treating large and small animals. Over the years, Bob has transitioned into large animal medicine. He moved to Port Perry in 1976 and opened a 2nd clinic, Port Perry Veterinary Services. Bob's interests include Standardbreds, mountain biking, fishing and gardening. In March 2014, Bob retired from large animal practice but you will probably see him around on occasion at the office or helping out with appointments!