Meet Our Doctors

Veterinarian Tucson » Veterinary Staff » Tucson Vets

Totten K. Warfield, Jr., DVM Tucson Vet Warfield

Dr. T.K. Warfield, a native Tucsonan, has been affiliated with Valley Animal Hospital for over 30 years. He became an associate of the hospital in 1975 after graduating from Washington State University, College of Veterinary Medicine. He attended the University of Arizona for his undergraduate degree. Go Cats!

Dr. Warfield’s practice has a strong focus on joint disease, soft tissue and orthopedic surgery. He serves as the primary veterinarian for several law enforcement canine units.

As an active community leader, Dr. Warfield has been a member of The Centurions for many years and has served on various boards throughout his career. Dr. Warfield enjoys outdoor activities and spending time with family. He and his wife, Donna, are spending every available moment spoiling their grandchildren.

John D. Vagnetti, Jr., DVM Tucson Vet Vagnetti

Dr. Vagnetti was inspired to become a veterinarian as a youngster while visiting his cousin’s veterinary clinic. As he watched a litter of puppies being delivered by c-section, he decided to pursue veterinary medicine.

Following graduation in 1983 from Michigan State University, College of Veterinary Medicine, Dr. Vagnetti left the Great Lakes, trees, and snow to begin his career at Valley Animal Hospital. Dr. Vagnetti’s professional interests include reptile medicine and small mammal medicine.

Dr. Vagnetti enjoys traveling, fishing, scuba diving, and reading. He and his wife, Alpha, include their two dogs in many of their outdoor adventures.

Blake A. Herrington, DVM Tucson Vet Blake Herrington

Following a four year tour in the U.S. Air Force, Dr. Herrington earned his B.S. degree in Cellular and Developmental Biology in 1982 from the University of Arizona. He received his D.V.M. in 1993 from Colorado State University, College of Veterinary Medicine.

Dr. Herrington joined Valley Animal Hospital in June of 1993. His service provides small animal medicine and surgery, with a focus on gastroenterology and avian medicine and surgery.

Dr. Herrington stays busy raising his children and caring for their many and various pets. He enjoys home improvement projects, bicycling, bagpipe playing, as well as traveling.

Debra P. Kellams, DVM Tucson Vet Deb

Dr. Debra Kellams was born and raised in Erie, Pennsylvania. Following graduation from Edinboro University in 1976, she moved to Tucson to work in the virology lab at the University of Arizona. Her background in the medical field and great love of animals influenced her decision to pursue a career as a veterinarian.

Dr. Kellams joined Valley in 1985, after graduating from Colorado State University, College of Veterinary Medicine. Her service provides small animal medicine and surgery, including special interests in avian and exotic mammal medicine and surgery. She has also developed her skills in veterinary abdominal ultrasound.

Her interests outside of veterinary medicine include spending time with family, skiing, aerobics, and cycling.

Alexis R. Moreno, DVM

Dr. Alexis Moreno worked at Valley Animal Hospital as a veterinary assistant during her undergraduate studies at the University of Arizona. She then attended Colorado State University, College of Veterinary medicine where she graduated as valedictorian in 2003. Following a small animal/exotic medicine and surgical internship at Florida Veterinary Specialists and North Bay Animal Hospital as well as an externship at Busch Gardens in Florida, she was hired as an associate and practiced in Tampa Florida before returning to Valley as a staff veterinarian in October 2005. Dr. Moreno enjoys cardiology, ultrasonography, avian and exotic mammal medicine and surgery, as well as emergency medicine. She is currently the chief veterinarian for our local AZA accredited Reid Park Zoo where she provides medical and surgical care for their over 600 avian and exotic mammal collection. Dr. Moreno and her husband have three daughters and enjoy spending their leisure time outdoors whenever possible!

Ashley K. Morgan, DVM Tucson Vet Morgan

Dr. Ashley Morgan is an Indiana native who graduated in 2006 from Purdue University School of Veterinary Medicine. She then completed an internship at Valley Animal Hospital prior to joining the hospital as an associate in 2007. Dr. Morgan enjoys emergency medicine as well as working with all species of animals, including exotic pets and zoo animals.

Dr. Morgan’s family includes her husband, son and their cat. Her hobbies include outdoor activities, puzzles, NASCAR racing, and motorcycles.

Lindsay McCrady, DVM Tucson Vet Lindsay

Dr. Lindsay McCrady grew up in Tucson, AZ and became interested in veterinary medicine during her eleven years of participation in 4-H showing pygmy goats. She completed her undergraduate studies
at the University of Arizona and earned a B.S. in Veterinary Science with a minor in Chemistry in 2005. During that time she also worked as a veterinary technician here at Valley Animal Hospital and became manager of the emergency service. She then earned her Doctor of Veterinary Medicine degree from Colorado State University in May of 2009, graduating with recognition from the International Veterinary Emergency and Critical Care Society. From there she moved to Florida and completed a specialty internship in Small Animal Medicine and Surgery. Dr. McCrady has eight years of experience as an emergency veterinary technician and has a strong interest in Emergency and Critical Care Medicine. Her other professional interests include internal medicine and small ruminant medicine.

She elected to move back to Arizona to settle down and be close to her family. She rejoined the Valley team with hopes of ultimately joining in partnership with her sister, who is also a veterinarian at Valley, and be at the forefront of gold standard veterinary care. In her free time, Dr. McCrady enjoys snuggling with her three kitties, riding her ATV, water-skiing, spending time with her family and playing volleyball. She is also very passionate about goats!!!

Amy Hoffman, DVM Tucson Vet Hoffman

Dr. Amy Hoffman is originally from western New York and began her career in veterinary emergency medicine as a veterinary assistant at an emergency clinic in Buffalo during her undergraduate studies. She then moved to Long Island and worked as an emergency technician for five years. She then attended Ross university and completed her clinical year at Cornell university, graduating with her DVM in 2002 with honors. Amy has worked multiple veterinary emergency practices from Long Island to Las Vegas. Most recently she spent a year at a specialty and referral practice in Pittsburgh, Pa. She moved to Tucson to join the Valley Animal Hospital family in 2011 and hopes to have found her new home. Her interests include cardiology and strong interest in feline and pocket pet emergency and critical care medicine.
In her spare time she is kept quite busy with her husband, 4 children, 5 cats, an English Bull Terrier, 3 guinea pigs, 2 chinchillas, 7 parakeets and a green Iguana. With any other free time she enjoys yoga, music and horseback riding.

Denise Gordon, DVM Sahuarita Vet Gordon

Dr. Denise Gordon began her long association with Valley Animal Hospital in 1984, working as Dr. Kellams’ technician for much of that time, and leaving in 1995 to travel and pursue her veterinary college aspirations.  Upon graduating from Ross University, she relocated to Pinetop, Arizona where she worked as a associate veterinarian  for over four years, eventually moving back to Tucson to be closer to her family.

Having started as a volunteer, then a certified veterinary technician, and eventually studying to become a veterinarian, she has worked for over 25 years in the field and feels lucky to arrive at work each day thoroughly enjoying her job.  Dr. Gordon is a strong advocate for preventive medicine and looks forward to assisting the community of Sahuarita with the care of their Canine and Feline companions.  She includes six dogs as part of her close knit family.

Lucy Schroth, DVMTucson Vet Schroth

Dr. Schroth was born and raised in Brooklyn, NY and earned a bachelor’s degree in chemistry from Oberlin College, in Ohio. She graduated from Cornell University, College of Veterinary Medicine in 1980 and then practiced in southeastern Pennsylvania until 2007 when she and her husband moved to Cape Cod, Massachusetts to be closer to her husband’s teenage son. Dr. Schroth and her husband moved to Tucson in 2012 and plan to make this their permanent home.

Dr. Schroth owned her own companion animal practice for 13 years before concentrating on emergency and critical care medicine. Her other veterinary interests include; internal medicine, soft-tissue surgery, cytology, dermatology, and pocket pets.

In her spare time, she enjoys knitting, making polymer clay miniatures, music (classical and southern gospel), gardening, and Christian Ministry. Her husband is the pastor of a new non-denominational church in Tucson. Their animal family currently consists of a German Shepherd named Ginny, but they hope to raise some chickens and goats in the near future.

Kaitlin Arntzen, DVMTucson Vet Hoffman

Dr. Katie Arntzen is originally from Boston and completed her DVM degree at Tufts University. She had a variety of pets growing up and knew from a young age that she wanted to someday become a veterinarian. She has always had a keen interest in wildlife as well as small animal medicine, and has recently returned from South Africa where she was working with a variety of species including lions, rhinos, elephants, and wild dogs. Katie spends much of her free time with her dog “Peaches” who she has newly adopted from an Arizona animal shelter. She enjoys spending time outdoors and the change from cold Boston winters to sunny Arizona!

Our Interns


Jennifer Ondera, DVM

Jennifer Ondera was born and raised in Illinois, completing her veterinary degree at the University of Illinois- Urbana Champaign in 2013.  Growing up, she was very interested in medicine and always loved visiting the zoo.  After a conservation trip to South Africa, she decided to put the two things she loved together.  While in vet school, she developed an interest in behavior and wildlife conservation.  In the future, she hopes to complete a zoo medicine residency and to pursue a career where traveling abroad is involved.  Outside of work, Jennifer can often be found running or hiking with her two dogs- Sophie and Ruby, enjoying time with her family and friends, reading, watching movies, or when time permits- traveling.

Carla Bernal, DVM

Dr. Carla Bernal is a Florida native who graduated from the University of Florida College of Veterinary Medicine in 2013. An undergraduate internship in Namibia, Africa with the Cheetah Conservation Fund shaped her passion for wildlife and zoological medicine. Dr. Bernal’s professional interests include exotic, zoo, and wildlife medicine, small mammal medicine, soft tissue surgery, ophthalmology, and emergency medicine. She plans to pursue board certification in zoological medicine. 

Dr. Bernal enjoys yoga, running, hiking, skiing, and traveling. Her two cats, Senghe and Kyila, and two guinea pigs, Thor and Loki, have come to spend the year with her in Arizona. She is looking forward to exploring more of Arizona in her spare time!

Brian Rensema, DVM

Dr. Bryan Rensema grew up in rural Kentucky where he received his BS in Biology and Chemistry from Morehead State University.  Dr. Rensema then moved to Tempe, Arizona where he worked as a chemist for Intel before attending and graduating from veterinary school at Oregon State University in 2013.  Dr. Rensema’s professional veterinary interests include: surgery (orthopedic and soft-tissue), exotic/avian medicine, neurology, diagnostic imaging, and zoological medicine.  Dr. Rensema shares his home with his wife, two children, and a green cheek conure and, after completing the internship program at Valley Animal Hospital, plans to pursue a career in veterinary small animal and exotics practice.  In his spare time, Dr. Rensema enjoys hanging out with his family, camping, cycling, music, beer (brewing and drinking), and playing loud guitar.