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Mark S. Hennis, D.V.M. is the President of the Sagamore Hills Animal Hospital, Inc. (SHAH) and a staff veterinarian.  He attended the Berea City School District through his junior year in high school then graduated from the East Holmes School District in rural Holmes County, Ohio in 1974.  He attended Baldwin-Wallace College earning a B.S. in Biology with minors in chemistry and history.  He graduated magna cum laude in 1978 with two distinguished awards, the Freshman Chemistry Prize and the Ruesegger Biology Award.  He attended The Ohio State University College of Veterinary Medicine for four years, graduating cum laude in 1981.

Dr. and Mrs. Hennis met at Baldwin-Wallace College and dated for many years before marrying in 1981. They moved to New Hampshire in 1981 for one year where Dr. Hennis was employed by the Exeter Veterinary Hospital, Inc.  Upon their return to Ohio, they started a small animal practice in their home.  This practice matured into SHAH in 1989.  They have one son, Richard Scott Hennis, born in 1984 who has been involved with the practice since learning to walk.  They have the privilege of being the keepers of one middle-aged English Bull Dog called Boudica and one mischievous cat named Tyler.

Annette and Mark Hennis enjoy photography and traveling.  They have visited and explored 49 states and 2/3rd of the Canadian provinces.

Dr. Hennis is a member of the Cornell Feline Health Center (FHC), the Ohio Veterinary Medical Association (OVMA), the American Veterinary Medical Association (AVMA) and Phi Zeta, a veterinary honor society.   Dr. Hennis is accredited by the U.S.D.A. to issue interstate and international health certificates for the transportation of pets.