Our Staff

Dr. Fred photo

Thomas A. Fredenhagen, DVM and Co-Owner

Thomas A. Fredenhagen, DVM (aka “Dr. Fred”) was born in St. Augustine, FL and raised in Palatka, FL. He attended St. Johns River Junior College and the University of Florida, before receiving his DVM degree from Auburn University in 1976. After an internship in Tallahassee, FL he moved to the Jacksonville/Orange Park area to continue companion animal practice. He established and ran the Argyle Animal Clinic for 10 years. He has been practicing veterinary medicine for more than 35 years. He is a member of the American Veterinary Medical Association and the Florida Veterinary Medical Association. He has worked with and been a board member of Safe Animal Shelter.


Karen photo

Karen Fredenhagen, Veterinary Technician and Co-Owner

Karen Fredenhagen has been a Veterinary Technician for more than 23 years. Her areas of extensive experience include surgery, special needs, nutrition, acupuncture / homeopathy (studied under Dr. Peggy Flemming for four years), behavioral counseling and laser therapy. She also manages the staff and hospital business operations. She rescues owls, hawks and horses to name a few. Karen shows horses and has shown dogs. Karen has assisted at Safe Animal Shelter and served on the Board of Directors.


Karen and Dr. Fred

Dr. Fred and Karen are dedicated partners both professionally and personally. They complement each other with their combined knowledge and experience. They have been married since 1998 and have three children – Ross, Jessica and Jillian and several four-legged kids – dogs, cats, chickens, horses and a recent addition of a Dwarf goat, named Sophie. They enjoy horseback riding, camping, gardening, and spending time on their small farm named appropriately “Second Chance.”


Tammi photo

Tammi, Veterinary Technician

Tammi started in veterinary medicine in the summer of 1991 in South Carolina. When her family moved to Florida in 1994, she continued as a technician at a general practice office in Jacksonville. She has been at Kingsley Animal Hospital since 2000. Tammi’s primary experience is in general practice, however, she has several years experience in emergency medicine and surgery. Tammi is married to a very understanding fellow animal lover who also has veterinary technician experience. Their “children” are: 5 dogs (Chihuahua- Ricky; Mastiff Mix- Aurora; Mastiff- Gunner; Chihuahua- Monty; Rottweiler- Amina), 4 cats (Socrates, Aristotle, Aries, and Theodore), and a pot-bellied pig named Pip (as in Pip Squeak). They have also parented, fostered, and raised many other animals over the years and are sure to have many more to come. Tammi has a never-ending passion for animals and they are an integral part of her life!


Grace, Veterinary Technician

Grace joined the Kingsley Animal Hospital family in February 2015. Her love for animals shows every day when she walks through the door, as well as through her volunteer work with organizations such as the Jacksonville Zoo and wildlife rescue centers. Her zoo at home includes 4 pups: Jimi (a chihuahua/dachshund mix), Harper (a lab mix), and Ruby & Sassy (chihuahuas). Her other passions include binge-watching shows on Netflix, going to the beach, and taking her 4-legged friends to different parks around the city.



Clyde, Greeter and KAH Mascot

Clyde was a kitten that came to us from the Safe Animal Shelter in 2001. He greets everyone as they walk into the hospital. He loves to be petted and have his belly rubbed, and may even climb up on your shoulder.

Our beloved Clyde crossed the Rainbow Bridge April 18, 2015. He was truly the heart and soul of our Kingsley Family! He will be missed terribly and always remembered. WE LOVE YOU, CLYDE!!

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