Our Team

Dr. Sheri Clarkson grew up in Regina, Saskatchewan but has strong family roots in Alberta which is the reason she returned to Alberta after gathering advanced education in the United States.  In 1996, Sheri graduated from the Western College of Veterinary Medicine, in Saskatoon, Saskatchewan.  After the completion of her veterinary degree in 1996, she went to Tufts University, Foster Hospital for Small Animals, in North Grafton, Massachusetts, to pursue an internship in Emergency Critical Care and Anesthesia. Then from 1997 through to 2000, Sheri was in Lansing, Michigan at Michigan State University Veterinary Teaching Hospital completing a Small Animal Internal Medicine residency. During her residency she also spent time at North Carolina State University Veterinary Teaching Hospital in the Oncology department.

Since becoming board certified in Internal medicine, Sheri worked in three large private practices with specialty referral hospitals one in North Carolina (2000 – 2003) and two in Calgary Western Veterinary Specialty Centre (2004-2009) and Fish Creek 24hr Pet Hospital (2009- 2021.)  Recently with the support of her family and business partners (Dr. Laura Major and Dr. Heather Suttie) they have opened Trinity Hills 24hr Pet Hospital in Calgary.  In September 2021 she left Fish Creek 24 Hour Creek Pet Hospital so that she could continue offering her type of specialty practice to the veterinary community of Calgary and surrounding areas outside the umbrella of corporate specialty care.

She has published research papers have concentrated around the development of a diagnostic test for diabetes insipidus in the dog and Shetland Sheepdog Leukodystropy (a disorder in the Sheltie defined her residency at MSU).  During her residency she developed a strong interest in diagnostic imaging (ultrasound) and have integrated this extensively in to her practice. Her interests are diverse but endocrinology, gastroenterology (bowel, liver, pancreas), nephrology/urology (kidney and bladder) and immunology/hematology top the list.
Sheri has a husband, two daughters, two cats and a Standard Schnauzer that keep her busy when she is not at work.

Dr. Heather Suttie was born and raised in Calgary. She went to the University of Calgary from 2002-2007 where she obtained a Bachelor of Science degree in Zoology. Heather graduated from the Western College of Veterinary Medicine in Saskatoon in 2011 and promptly returned to Calgary. Heather has been practicing emergency medicine and reproduction for ten years. She has also travelled to Guatemala, Cambodia, Belize, Nicaragua and the Galapagos Islands providing veterinary care. In 2020 Heather had the privilege of being one of the trail veterinarians at the historic Iditarod sled dog race.
Passionate about providing personal and individualized care, Heather treats every patient like her own. She is proud to join her partners, Drs Sheri Clarkson and Laura Major to create Trinity Hills 24 Hour Pet Hospital and continue to provide veterinary care to the community with the kindness and authenticity of a private hospital.
Heather loves the city of Calgary and surrounding areas. She spends most of her free time trail running in the mountains year round or supporting local restaurants and breweries. She has a crazy little pug named Turbo and an old cat named Neuter (named after her very first feline neuter procedure).

Dr. Laura Major grew up in Ajax, Ontario and attended two years of her Bachelor of Science degree before being admitted into the Ontario Veterinary College.  She graduated with honors from OVC in 2008 and moved to Calgary that fall.  Dr. Major has always had a passion for emergency medicine and surgery and also developed a special interest in veterinary dentistry as oral health is a very important factor that contributes to total body health for our companion animals. 

Dr. Major has also had the pleasure of being a repeating visiting professor at the St. George’s School of Veterinary Medicine for their Junior Surgery and Anesthesia program and enjoys passing on her knowledge.  She has also travelled and volunteered for sterilization clinics abroad along with One Health One Medicine programs which coordinate human medical professionals with veterinary professionals to provide care for areas that would not otherwise receive this. 

Dr. Major lives with her two cats Karma and Rogue and her dog Echo who used to be a life saving canine blood donor but is now enjoying his much deserved retirement.  Rogue is following in her big brother Echo’s footsteps and is happy to be a feline blood donor when the need arises.
In her spare time Dr. Major enjoys travelling, playing floor hockey, spending time with her furry family, and exploring our beautiful city and surrounding areas.

Dr. Peyton Williams Ware was born and raised in Pontotoc, Mississippi.  She graduated with honors from Mississippi State University College of Veterinary Medicine in 2019.  Shortly after graduating veterinary school, Peyton and her husband (Tommy), a beef cattle veterinarian, decided to leave the southeast United States for career opportunities in Alberta.  Peyton began her career in small animal general practice but decided to make the transition to emergency medicine in January 2022.  Because Peyton believes that communication plays an integral role in quality veterinary care for patients in the hospital and at home, she makes it a priority to listen to concerns, answer questions, and explain procedures and illness in a way that is easy to understand even in the highly emotional or stressful situations that often arise with emergency care.

Outside of the hospital, Peyton enjoys getting outdoors for adventures with her four dogs (Macy – German Shepherd; Toby, Reba, and Winston – Australian Shepherds), tackling her next DIY home project with her husband, or settling down for the occasional night in with cuddles from her two black tuxedo cats (Baby and Carver).

Dr. Gayle Cummings was born and raised in southern Alberta. She pursued post-secondary education at the University of Saskatchewan in Saskatoon and obtained a degree in Agriculture with a major in Animal Science before continuing on to complete her DVM from the Western College of Veterinary Medicine in 2009.

Since graduation, Gayle has explored the areas of rural and mixed animal practice in both BC and Alberta before accidentally discovering that companion animal emergency medicine and surgery were her true calling. She is extremely happy to be a part of the team at Trinity, where the opportunity to work among friends in an environment that supports professional growth and well-being as the key to longevity in a demanding career is something in line with her own personal and professional beliefs.

In her free time Gayle can be found training her obnoxious blue heeler for agility, riding one of her horses, or hanging out with her chickens on her acreage outside the city. She and the husband enjoy hiking, fishing and taking on various building projects around their property.

Dr. Jacquelyn Fulford was born and raised in Fort McMurray. She travelled to Australia to study Marine Biology and completed her Bachelor of Science while experiencing the beauties of the Great Barrier Reef. She then continued in Australia to complete her Veterinary degree graduating with honours in 2013 from the University of Sydney. Career opportunities brought Jacquelyn back to Alberta after graduation to work initially in her home town before moving to Calgary in 2015. Having worked both in primary and emergency care, she enjoys the many challenges of the veterinary field and the ability to always be learning and growing.

Jacquelyn’s fur family started with her cat, Simon, who has been with her since vet school. Once back in Canada she later adopted a Pitbull mix named Diamond and a little ginger cat Bundy (short for Bundaberg). Outside of work, Jacquelyn enjoys heading to the mountains for hiking and camping but also relaxing at home reading and gardening.  She is very excited to be part of the Trinity team and continue her professional growth with such a supportive and experienced group.

Dr. Michelle Thompson was born and raised in Hong Kong, before moving to Canada as a teenager. She graduated from the Western College of Veterinary Medicine (WCVM) in 2019. During her studies, she was also enrolled in the dual degree program, and graduated with an MSc in Large Animal Clinical Sciences from the WCVM, focusing on antimicrobial resistance in feedlot cattle. Michelle is especially interested in animal behaviour, nutrition and reproduction.

She relocated to Alberta in 2019 and began practicing in a small animal general practice. While she enjoys building long-term relationships with clients and providing personal care to their animals, she made the switch to an emergency clinic in 2022. Michelle believes that the experience and diversity of cases that accompany emergency medicine will enhance the quality of care that she offers clients.

Along with her husband and young son, Michelle enjoys going on long walks with her two Aussies, Molly and Bruce. She also has a cat, Finn, who holds down the fort when she’s not home. Outside of the clnic, Michelle and her husband manage a small purebred cattle operation on their farm north of Cochrane.


    Check in Form


      Referral Form

      Pet Information

      Medical History

      File types accepted: (pdf,txt,doc,docx,jpg,png,heic,heif)

      File types accepted: (pdf,txt,doc,docx,jpg,png,heic,heif)

      File types accepted: (pdf,txt,doc,docx,jpg,png,heic,heif)
      ** Reminder to attach patient history

        Internal Medicine History

        Prior to any appointment or recheck with the Internal Medicine Service clients must fill out this form.


        What is your pet's diet?

        Please answer the following questions with Increased, Decreased, or Normal


          Reproduction Form

          New reproduction service policy – As of December 19th 2022, we will only perform progesterone testing on females over 1 year of age. We do not collect or breed every dog that is presented to us as it is our goal to only partner in helping to create healthy puppies. We will require breed specific health testing according to your breed's parent club. Requirements for each breed can be found at www.ofa.org/browse-by-breed

          Client Name *

          Address *

          Dog Information