Mark T. Reilly, D.V.M, DABVP is originally from the South Shore area, having graduated from Abington High School. After attending the University of New Hampshire and earning a B.S. in Animal Science, he went on to Tufts University School of Veterinary Medicine. After graduating from Tufts in 1991, Dr. Reilly set off to work on the East coast horse racing circuit with Dr. Richard Kester. He spent time working in the New York/New Jersey area and winters in southern Florida.

He then moved on to work at Delaware Park, before landing on Cape Cod where he ultimately established a large animal ambulatory practice in 1995. After watching the racetracks in Massachusetts close in 1997, he combined his equine practice with a small animal practice, forming Mid-Cape Animal Hospital.