AAHA accredited small animal veterinary clinic in O'Fallon, Missouri. As an accredited hospital, we have regularly undergone evaluations by AAHA to ensure that we comply with the association's high quality standards of care. There are close to 900 standards that are evaluated. These standards cover nearly every aspect of our hospital, including surgery, pharmacy, laboratory, exam facilities, patient care, cleanliness, client service, emergency services, diagnostic imaging, and anesthesiology.

Payment Options

  • Cash Only, Debit Cards, Discover, MasterCard, Personal Checks, VISA, Care Credit

Contact Details

  Website
  City O Fallon , MO
  Zip Code 63368
  Address 2301 Technology Drive
  Phone Number (636) 561-9122
  Fax 6366250418

  • I would recommend this business

I lost my 14 year old American Bulldog, Boss, two weeks ago. He was my world. I’m not sure if I can put into words how Dr. Callaway and her staff made saying goodbye to him such a kind and loving experience. Every appointment we had with them, including his final moments were ones filled with love, patience, and thoughtfulness. I am forever grateful to this phenomenal group.

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Overall ratingExcellent

  • I would recommend this business

Dr. Hammerle has saved our household. Seven years ago, I adopted a rescue-declawed cat who was always shy and on the insecure side. This summer, I had the good fortune of a friend taking my Rigbe to The Pet Doctor to have her paws checked and, subsequently, repaired via operation. Cut to less than 60 days later and the toes healed beautifully, and Rigbe is basically living a whole new life. A cat that spent 23 hours a day hiding from the world suddenly became confident and present. Where she used to get upset about foster kittens, now she tolerates and sometimes even plays with them. It breaks my heart that I didn’t take her to The Pet Doctor sooner. Dr. Hammerle also took extreme care to ensure Rigbe was healthy the day of surgery, which is what you always want to know about anyone putting your pet under.

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Overall ratingExcellent

  • I would recommend this business

Dr. Marcy has been amazing with all 4 of my dogs. Her new office location is wonderful, the staff is knowledgeable and helpful, and they treat me and my dogs very well.

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Overall ratingExcellent

Customer Testimonials

Dr. Callaway is amazing. A top notch doctor who really cares for her patients. I have worked along side this doctor in the past and I highly respect and trust her. The Pet Doctor is very lucky to have her. The facility is amazing as well. I also have to say that this is a very caring clinic who also impressed me by their donation of a service dog to United Services for Children, a school for children with special needs. I would highly recommend them for your pets care. They will be treated like family.


The Pet Doctor team is exceptionally skilled, professional and very caring. They work with you to explore every opportunity to help your pet. You can't find a better team than this anywhere.


Current words in the English Dictionary can't describe the talent and compassion of the entire staff at The Pet Doctor. From the moment you walk in the door, you'll notice the difference in the way the way they approach veterinary care. The details are noticeably addressed. Our pets do their best to tell us how they're feeling and the entire crew at The Pet Doctor is listening. I'm not some psycho pet owner. I just believe that we owe our pets the best and this is where they get that.


Thank you to the Pet Doctor team for taking care of Gracie as she went to heaven. The team was so kind and wonderful to me when I made the appointment. Their service was phenomenal. I paid over the phone and asked them to choose her urn. I love this team!! Gracie was well taken care of


The Pet Doctor has been our veterinarian since we moved to Missouri in 2004. The staff is friendly and capable with all of our pets over the years, including dogs, cats, and a rabbit! Dr. Marcy’s early cancer diagnosis in one of our cats helped save her life! The Pet Doctor supports area rescues as well, giving their time and energy to animals in need.

Social Activity

We love how JEMA helped us design our certified Fear Free Pets hospital!
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So cute! We are proud to be wildlife rehabbers! This little guy will be released as soon as he is old enough to take care of himself.
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Dr. Callaway loves working with snakes! This baby ball python has such a beautiful color pattern.
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Please make sure your pets are vaccinated and protected from parvovirus. It is a devastating disease.
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Thank you to all who serve and protect our country.
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Ever wonder what to feed your pet? Check out this new blog about pet diets written by Dr. McManus https://thepetdoctorinc.com/blog/
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