Welcome to St. Marys Veterinary Clinic! We’re proud to provide a wide variety of veterinary medical services for cats and dogs.
Get To Know Us

Proudly locally owned and operated, serving our community with care!
Our Caring & Compassionate Veterinary Team!
Meet the Veterinarians & Team of St. Marys Veterinary Clinic in St. Marys! We’re pleased to provide exceptional vet care for your pets! Please call us at (519) 284-3501 to speak to one of our caring veterinary professionals!

Outside of veterinary medicine, Larry enjoys gardening, landscaping, slo-pitch (before Covid), cycling, reading, theater, kayaking, rockhounding, and walking the family dog Bonnie. Patsy and Larry are active members of First Baptist Church in St. Marys serving on leadership teams and involved in many church activities. Both also spent many years as part of the St. Marys Skating Club. Larry also volunteered as part of the Interclub North Region of the Western Ontario Section of Skate Canada and was involved in planning and hosting a number of skating competitions. Larry is a member and volunteer of the Canadian Baseball Hall of Fame.
Professionally, Dr. Joosse is a member of the College of Veterinarians of Ontario, the Ontario Veterinary Medical Association, Canadian Academy of Veterinary Dermatology, London and Area Veterinary Association, and the Golden Triangle Veterinary Academy (GTVA) on whose executive he has volunteered for a number of terms.
The Joosses have a son Matthew and a daughter Sarah. Matt has Bachelor of Science and Masters of Public Health degrees from the University of Guelph. He and his wife Veronica (also a Guelph grad) live in Sarnia and have two children Colin and Rita. Sarah has a Bachelor of Education from McGill University and a Masters of Education from the University of British Columbia, she and her husband Derrick live in Guelph.

She also obtained her Bachelor of Science in Biology and a minor in Chemistry from Wilfrid Laurier University in 2017. She obtained her Doctorate of Veterinary medicine, with distinction, at the Ontario Veterinary College in 2021. She currently lives in Tavistock with her husband, Josh and her Golden Retriever, Denny. Jessica enjoys spending her spare time with her friends and family, staying active and travelling as much as possible. She has a specialist interest in long term preventive healthcare, surgical procedures and orthopaedic concerns.

He joined the Kirkton Veterinary Professional Corporation in the spring of 1999 and later completed the Dairy Certificate Program in 2004. Jeff works in the Food Animal division of the practice and also practices Small Animal Medicine out of both the Kirkton Veterinary Clinic and St. Marys Veterinary Clinic. Jeff Lives outside of St. Marys with his wife Kim and their three children James, Hannah and Jonathan and a cat, Amelia. He enjoys sailing, camping, and canoeing when time permits.


Cassandra graduated, with distinction, from the University of Guelph in 2019, where she obtained her Bachelor of Science in Animal Biology. She then went on to obtain a Masters of Science in Animal Behaviour and Welfare from the University of Guelph in 2020, where her project focused on the long-distance transport of cattle. Finally, she obtained her Doctorate of Veterinary medicine, with distinction, from the Ontario Veterinary College in 2024. Cassandra currently lives in Guelph with her fiancé, Michael, and their shepherd/retriever mix, Ralph.
Cassandra enjoys spending her free time outdoors and connecting with nature, participating in activities such as hiking, camping, stand-up paddle boarding, yoga, and snowboarding. She has special interests in small animal preventative medicine as well as emergency and critical care.

In her free time, Dr. Tiffany enjoys spending time with her dog Kiwi, reading, cooking, playing pickle ball, spending time with friends and family, and strolling the beautiful beach in Goderich.




In her spare time, she enjoys crossfit classes at the local gym, playing soccer, 4-wheeler trips and spending time with her friends and family.
She currently resides in Lucan with her husband Bernie, two boys Hank & Tommy, her Doberman Reg and cat Gordon.






In her free time Kassity enjoys, spending time with her family & friends.


An understanding of the meaningful relationship between clients and their pets, led her to pursue a leadership role in veterinary medicine. She thoroughly enjoys team building, customer service training and compassionate patient care.

Location
500 Water St S,
St. Marys, ON N4X 1B4
Contact
Phone: 519-284-3501
office@stmarysvetclinic.ca
Hours
Monday-Friday: 8am- 6pm
Saturday: 8am – 3pm
