About Us

We’re one big family.



451 Bandera Rd.
San Antonio, TX 78228
Click here for directions.

Contact Us

P: 210-735-5259
E: bluecross124@gmail.com
F: 210-735-1604



Mon - Fri: 8 AM - 5 PM
Sat: 8 AM - 12 PM
(every other Saturday)
Sun: Closed

We look forward to getting to know you.

We’re not just here to be your vet – we want to be your partner for your pet’s entire life. We work together to ensure that your pet is happy and healthy.

Our Vets and Practice Manager

Dr. Mark Beissner

Dr. Beissner's Bio
Dr. B. is a 1992 A&M graduate. He lives on a ranch with cattle, horses, several dogs and cats. In his free time, he loves ranching and farming. He is married with one son and one granddaughter.

Dr. Ken Theus

Dr. Theus' Bio
Dr. Ken Theus was born and raised in Monroe, Louisiana. He earned a Neuroscience undergraduate degree from Washington and Lee University in Virginia as well as his DVM degree from Kansas State. He shares his farm with numerous sheep, goats, ducks, geese, parrots and dogs. He is also involved in the SA Western Heritage parade every year.

Dr. Elizabeth Gateman


Dr. Gateman's Bio
Bio coming soon!

Rachel Treiber

Practice Manager

Rachel's Bio
Bio coming soon!

Customer Service Reps

Debra Nuncio-Sanchez

Customer Service Representative
Debra's Bio
Debra has been with us for over 20 years which makes her our most experienced customer service rep!

Teresa Gonzales

Customer Service Representative
Teresa's Bio

Teresa has been working at Blue Cross Pet Clinic for over 20 years. At home, she has too many cats and dogs to count!

Mari Ruiz

Customer Service Representative
Mari's Bio
Mari is a Customer Service Representative here at Blue Cross Pet Clinic. At home, she has two daughters and two cats.

Veterinary Assistants

Violet Coronado

Veterinary Assistant
Violet's Bio
Violet has been with us for over 2 years. Her family is comprised of a daughter and three dogs.

Sheena Wood

Veterinary Assistant
Sheena's Bio
Sheena has been with us for over 10 years and has four dogs at home.

Tiffanie Vargas

Veterinary Assistant
Tiffanie's Bio
Tiffanie has been with us since October 2019. At home, she has 2 pugs.

Darcy Campos

Veterinary Assistant
Darcy's Bio
Darcy has been working at Blue Cross Pet Clinic for over 10 years. At home, she has numerous huskies.

Larry Talamantez

Veterinary Assistant
Larry's Bio
Larry has been with us for over 3 years. He currently has one cat at home.

Amber Vela

Veterinary Assistant
Amber's Bio
Amber has been working here for over 10 years! She shares her home with four cats.

Ariana Gonzales

Veterinary Assistant
Ariana's Bio
Ariana has been with Blue Cross Pet Clinic for over a year and she has one dog.

Cassandra Brown

Veterinary Assistant
Cassandra's Bio
Cassandra has been with Blue Cross Pet Clinic since late Spring 2020. She has two dogs.

We proudly serve the pets of San Antonio, TX.

It is our mission to create a partnership with our clients to nurture the human-animal bond by providing compassionate veterinary care throughout every stage of your four-legged family member's life.

Have a question?

Complete the form below and we'll be in touch with you shortly.

We look forward to seeing you soon!

Book your appointment easily online.