Contact Information

Angel of Mercy Animal Critical Care
8734 Grissom Road
San Antonio, TX 78251
Phone: 210-684-2105
Fax: 210-256-0088

Business Hours:
All Night, Seven Days
Open Monday–Thursday, 6 p.m.–8 a.m.
Open 24 Hours on the Weekends
Friday 6 p.m.–Monday 8 a.m.
Open 24 Hours on Holidays

Meet The Doctors

Dr. Deborah A, Ridder, DVM

Dr. Deborah A, Ridder, DVM

Dr. Ridder graduated from Texas A & M University with a bachelor of science in biomedical science and a bachelor of science in veterinary science.  She has her doctor of veterinary medicine from Texas A & M University.

Dr. Ridder began her career in Euless, Texas, at Airport Freeway Animal Emergency Clinic, where she practiced emergency and critical care medicine for 17 years.

She then returned to San Antonio, Texas, her hometown, in 2000 and established Angel of Mercy Animal Critical Care to provide emergency veterinary services to the northwest area of the city. Dr. Ridder has made emergency and critical care her career since 1983.

Thomas J. Babbitt, DVM

Thomas J. Babbitt, DVM

A native Cornhusker, Dr. Babbitt received his undergraduate degree from the University of Nebraska at Lincoln.  He returned to Kansas State University to study veterinary medicine, graduating in 1994.

In his first years, he practiced small animal medicine, mixed with exotic and large animal medicine.  Dr. Babbitt moved to San Antonio in 1997.  Since that time, he has practiced, almost exclusively, small animal medicine and surgery.

More than five years ago, Dr. Babbitt began his association with Angel of Mercy Animal Critical Care.  In that time, his interests have gravitated more toward emergency and critical care of small companion animals.

Stan Mikula, DVM

Stan Mikula, DVM

 Dr. Mikula, a fifth generation Texan, graduated Cum Laude from Texas A&M University School of Veterinary Medicine in 1998.  Early in his career, he worked both Small Animal day practice, including Avian Medicine, along with part-time Emergency Medicine.  In 1999, he moved to Austin where he worked almost exclusively in Small Animal (dog and cat) Emergency Medicine and Surgery.  Dr. Mikula began working at Angel of Mercy in the fall 2010 initially as a relief Veterinarian, now as full-time.  He has special interest in Internal Medicine and soft tissue surgery.

In his spare time, Dr. Mikula is an accomplished bodybuilder and power lifter.  He enjoys water sports, traveling, and his 2 crazy cats, one of which is quite famous – a Munchkin named “Frito”.




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Angel of Mercy Animal Critical Care
8734 Grissom Road, San Antonio, TX 78251

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1) Do you offer any discounts?
Yes, we offer Military Discounts with an ID.

2) How much are exams for my animal?
Our basic exam fee is $60.

3) Do you offer payment plans / options?
We accept all major credit cards, cash, checks and CareCredit. Payment is due at time of services, with proper ID. 

4) What is CareCredit?
CareCredit is a specialized credit card that may be used for medical services – included are veterinary services, and medical and dental services. You can apply by phone at 800-365-8295 or online at
5) What types of pets are treated at Angel of Mercy Animal Critical Care?
We primarily treat dogs and cats. However, we do have relief veterinarians who may treat exotic pets (example: rodents, ferrets, birds, reptiles, etc.). Please call before bringing in your exotic pet to ensure that the veterinarian on staff will see him / her.
6) What should do if you pick up a stray animal?
You may call Animal Care Services at 311 or 210-737-1442. Picking up a stray animal entails accepting financial responsibility, as well as ownership of the animal. Unfortunately, our facility limitations do not allow us to accept stray animals.
7) Does Angel of Mercy Animal Critical Care offer vaccines and other routine veterinary care?
Being an emergency veterinary hospital, we do not offer vaccines and routine veterinary care. Please contact a regular daytime veterinary hospital for these types of services.

Helpful Links

National Animal Poison Control

Pet Poison Helpline

San Antonio Humane Society

Spay-Neuter Assistance Program, Inc.

Animal Care Services
210-207-4738  or 311

Spay Sa

Animal Defense League

Wildlife Rescue