Dr.Pete Kvarnstrom (Dr K.)  

I was born in Vancouver, Washington but spent most of my following years in rural communities throughout the central coastal regions of California. On the farm is where I learned about hard work and grew to love and appreciate animals. I completed both my Bachelor of Science in Veterinary Science and my Veterinary Medical Degree at UC Davis, where I graduated in 1998. 

Routine Exam

If you haven't been to a vet in a while, relax. Start with a complete checkup.

Mission Statement 


Animal Hospital

Dr. Brian Hayter grew up in Tustin, California and earned a Master's degree in Fine Arts prior to becoming a veterinarian. He taught English at community college and published poetry in several national publications before his love of animals led him to pursue his Doctorate of Veterinary Medicine at Auburn University where his interests included internal medicine, dermatology, and exotic species.

Dr. Hayter was named a Merial Summer Scholar where he studied the effects of BPA chemical exposure on perinatal mice. He was also given the opportunity to intern at the prestigious San Diego Zoo where he worked with all manner of species, including a panda bear, cheetah, cougar, and polar bear. 

Dr. Hayter and his wife, Catherine, are the proud parents of two rambunctious pair of boys, a baby girl, and a cockapoo named Skywalker. Dr. Hayter sets out to answer all client questions and provide the highest level of care for pets.    

Wellness Plans

We offer wellness plans for all stages of life, with the convenience of monthly payments

What to Expect


It's important to stay on top of vaccines, overall health, and training issues.

Meet Our Doctors


veterinarian,dog,cat, animal hospital, tustin

veterinarian,dog,cat, animal hospital, tustin
veterinarian,dog,cat, animal hospital, tustin

Dr. Coleing was born and raised in the rolling countryside of England, he has always been passionate about animals and knew from a young age he wanted to be a veterinarian. After graduating from the prestigious Royal Veterinary College in 2007, Dr. Coleing practiced small animal medicine in England before deciding to move to the sunnier climes of the US in 2009.
Dr. Coleing has an unwavering compassion and devotion to helping pets live happier, longer lives and a commitment to partnering with our clients to help make the best decisions for the health of their furry family members. 
 Dr. Coleing has loved to combine his love of travelling with wild life conservation. He has spent time researching monkeys in Sri Lanka and saving wild animals in South Africa. From lassoing giraffes to wrestling pythons and bottle feeding orphaned hyeanas.   
Dr. Coleing brings that same passion in everything he does and cannot wait to meet each and every one of you and your four-legged friends. 

  • Tustana Animal Hospital is dedicated to consistently provide the highest quality of compassionate veterinary care and offer an exceptional experience to our clients and their pets.

  • Our defining quality is the passion we bring to enhance the lives of our patients and their owners whilst fostering the human- animal bond.

  • We believe in partnering with our clients, through preventative care, education and the highest quality in veterinary medicine to allow our patients to live longer, happier lives. 

  • We promote teamwork amongst our staff and veterinarians and continually foster professional growth and education for the whole team to ensure the highest level of care for our patients. We do this whilst providing a positive, happy and respectful environment of which to work in.