Drop in and come see our NEW Animal Hospital. Larger and more exam rooms. New prescription drive-thru for easy prescription pick up. New hydro therapy pool and underwater treadmill. Dry rehab center for after orthopedic surgery. O'Sullivan Animal Hospital is a full-service veterinarian clinic in Barrie, open 24 hours a day, 7 days a week, all year round. We do not charge emergency fees. Book an appointment for your pet today.