McKnight Rhiannon, DVM
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McKnight Rhiannon, DVM
New clients will receive 50% off their first exam. Mention this coupon to receive your discount. Discount forfeited if you miss your appointment without calling us ahead of time to reschedule. Manage your pets' care and health, book appointments, request medication refills and more with the free and easy-to-use PetDesk app.

Vet Stop Animal Hospital is a full-service animal hospital in St. Peters, MO featuring an array of veterinary and grooming services. Between wellness care, surgery, radiology, dentistry, diagnostic bloodwork, skin and allergy testing and grooming, our pet experts do everything possible to keep your pet healthy and happy.
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Dr. Rhiannon McKnight is a graduate of the Ontario Veterinary College and completed an Internship of Medicine and Surgery at the University of Georgia. She has been practicing at Vet Stop Animal Hospital for twenty-five years. Her special interests include general surgery, nutrition, veterinary dentistry and routine preventative medicine.
Vet Stop Animal Hospital general wellness care services include wellness checkups, vaccinations, heartworm prevention, medication refill and pain management among other programs in place to keep your pet happy and healthy. At Vet Stop Animal Hospital, your pet is in good hands for surgical procedures.
Reviews (8)
Kristina Goodsell
Kristina Goodsell
Sep 17, 2021
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Our dogs are always treated so well here. Dr. Thornberry recently performed surgery on our Wolfhound and we couldn’t be happier with how well informed she (as well as the rest of the staff at Vet Stop) kept us… throughout the process. Everyone involved in the surgery was more than willing to answer any questions we had afterwards. The team at this clinic is very professional and compassionate; I highly recommend bringing your pets here.
Shauna Clark
Shauna Clark
Sep 15, 2021
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Wanted to send a shot out. I always worry about people meeting my mix breed staffy mutt. Some people think hard and some people just take her moment by moment. She has not had it easy with 3 medical emergencies resulting in hospital stays. One of those causing permanent reactive behavior. I felt very much at ease and it was nice to be able to be… inside with my pooch. I had her here for grooming a little while ago and she came out happy. Last time we went to a big name she acted like I had abandoned her and was very clingy (normally she's just pooped and passes out).
Thank you for calming
Kendra Willouer
Kendra Willouer
Jul 07, 2021
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The staff was so wonderful and Dr. McKnight put our concerns at ease. Bruce loved everyone and everyone loved our new pup too! It was so warm and welcoming for us and for him too. Thank you for taking the time today to make us feel so welcome ~ I’m already telling friends about our experience today❤️
Cindy Cagle
Cindy Cagle
May 11, 2021
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I have been with this "Vet" for 6 months with my 3 Golden Retrievers and have had numerous BAD experiences. 1) Grooming is HORRIBLE. Drop off at 8 am and not available to pick up until after 5pm. After I picked up, my dog's paws had not been trimmed or her belly, which I had explicitly requested. 2) Knowing the LONG wait times for grooming, I… scheduled two weeks in advance and requested a 8am groom to be followed by a 10am vet/shot. This was today's appointment. They had no record of my grooming appointment- so squeezed me in and charged me a $30 express fee! 3) They NEVER call you when
Jeff Hughes
Jeff Hughes
Feb 24, 2021
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Very friendly and knowledgeable staff. My dog is a fight dog rescue and they treated him so good. He has had a rough life before I adopted him. He was so excited and happy when going to the vet stop and happy… when he was done. I highly recommend the vet stop. See everyone soon for anything Dommie needs. Thank you all for being so good with him.
Jodi Rambert
Jodi Rambert
May 14, 2020
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Nooooi considerate of how I wanted to keep my address private against my abusive husband and then refuse care for my dog and then didn't give me an any other options about how to work this out she just simply walked away and gave me back my money and then I said no no no no no
Stefanie Stonebarger
Stefanie Stonebarger
Mar 24, 2020
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VET STOP has been so kind and understanding with my nearly 16yo cat Midnight. He is terrified of the vet office due to the office I use to take him to, and for about 10 years now the staff and doctors at Vet Stop have worked with him and his “extra” behavior and still been kind, gentle, and always given him excellent care. They truly understand and love their animal patients and always go the extra mile to take care of them. Idk what I’d do to care for my now elderly cat without their help.
Katie Jo
Katie Jo
Sep 30, 2019
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The vet and her tech, whom were both very pleasant people, performed Rukia’s routine checkup and gave her her shots quickly and efficiently, while exhibiting the utmost care and concern for her; not to mention, they accept debit/credit cards, which my dog’s old vet did not.