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 Dr. Frank Kostolitz established Yalesville Veterinary Hospital in 1990. Dr. Kostolitz attended the University of Parma in Italy where he recieved his DMV. He started practicing veterinary medicine in Middletown in 1984, focusing on small animal medicine and surgery. Dr. Kostolitz strives for only the best in patient care, client communication and satisfaction. Dr. Kostolitz lives in Cheshire with his wife, 3 children, and the newest addition to the family, their greyhound, Zippy.





Dr. Lisa Saravis was born and raised in Connecticut and obtained her bachelors degree at Connecticut College. After earning her veterinary degree from the University of Pennsylvania in 1994, she practiced small animal medicine in North Haven for the next eleven years before joining Yalesville Veterinary Hospital. She currently resides in Hamden and enjoys spending her free time with her husband, son, horses, and their mastiff, Czar.






Dr. Herbert Rosenoff recieved his veterinary degree from Cornell University. He served in the US ARMY as a veterinary officer for 4 1/2 years. He established, owned and operated a small animal veterinary practice on Long Island, New York for 14 years. Dr. Rosenoff was the medical director at North Shore Animal League and also for the Bide a Wee Home Association in New York City. He was a senior staff clinician at the Henry Bergh Memorial Hospital of the ASPCA in NYC and he was the chief veterinarian at the Center for Animal Care and Control in NYC. Dr. Rosenoff joined the staff at Yalesville in 2005. He currently lives in Killingworth with his wife, 4 dogs, 1 cat, and 3 birds.




 We would like to welcome Dr. Jill O'Callaghan as the newest doctor to join our team. Dr. O'Callaghan grew up n New Canaan, CT and graduated from Wake Forest University in North Carolina with a Bachelor degree in Biology in 1997. She then attended Kansas State University where she received her D.V.M. degree in 2002. Upon graduation she worked at a small animal hospital in New London for over 7years before joining the staff at Yalesville Veterinary Hospital in August 2009. She lives in Guilford with her husband, children and their dog named Charlie. Her clinical interests include internal medicine, surgery and acupuncture.