A Word from Our Vets

Read the stories of the vets who staff our clinic and oversee daily care of our animals.

Denise Dietsch, DVM 
Director of Veterinary Services

I’m a grad of the University of Missouri Veterinary College (Class of ’76) and a native St. Louisan who’s proud to have grown up on the South Side.

My first experience out of vet school was working in a private practice owned by one of the St. Louis Zoo veterinarians. Though I didn’t work at the zoo, his expertise with “exotics” attracted an unusual variety of animal clients. While I treated mostly cats and dogs, my daily routine during those seven years often included mountain lions, monkeys, birds and reptiles.

From there, I was on staff at another local private veterinary hospital. About 8 years ago I joined the staff of the APA Adoption Center. Here I am in charge of our outpatient clinic that is open to the public. I also oversee the healthcare of the dogs and cats that are housed in our shelter.

Outside the APA Adoption Center, I’m the mother of one lovely daughter, Alexandra, and 3 dogs and 2 cats. My free time is spent on remodeling and decorating my house or crafting miniatures. (Ask me about the guitars I’ve built!)

Shannon L. McCollough, DVM

I graduated from Colorado State University Veterinary School in 1990. After completing a one-year internship at the Sacramento Animal Medical Group in northern California, I began my career in Denver, CO at Alameda East Veterinary Hospital (of the Animal Planet Channel’s “Emergency Vets” fame). My husband’s job transferred us to Tulsa, OK for two years, and then brought us to St. Louis in 1995.

After working in general small animal practice in West County for almost 13 years, I left the private sector in September of 2008, to work on a short-term project for St. Louis County helping to implement a Reduced Fee Spay/Neuter program. Once I had a taste of working in animal welfare, working part-time for the APA is exactly where I want to be after almost 20 years in veterinary medicine!

I am a past president of the Greater St. Louis Veterinary Medical Association and a member of the Animal Welfare Committee for the Missouri Veterinary Medical Association. When not immersed in Veterinary Medicine and Animal Welfare, I spend time with my husband, Mark (a partner in a road construction company) and our son, Luke. We have 3 pets: McLaren – a Golden Retriever, Tucker – a Maine Coon, and Murcielago – a DSH. (Note: All 3 pets are named for a McCollough family passion: CARS!


The Services We Provide

Explore the care we offer through our APA Adoption Center clinic

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Help Find Lost Pets

Did you know 90% of lost, stray and unwanted St. Louis pets end up at one of our three agencies? Search our database or report a missing pet.

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Stay Informed with Dr. D

Get an overview of common health issues for dogs and cats from our clinic director.

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