MEET OUR VETERINARIANS

Our caring and compassionate team of veterinarians, technicians and veterinary assistants are here to help you with any questions or concerns you may have regarding your pet's health care and maintenance.

Donald Bissonnette, BSc., DVM

Senior Veterinarian,

Pet Vet Hospital Credit Valley

Dr. Bissonnette with "Panda" 

Dr. Bissonnette graduated from Ontario Agricultural College at the University of Guelph,  with a Bachelors Degree in Agriculture in 1982.  He entered the Doctor of Veterinary Medicine program at the Ontario Veterinary College soon after and received his DVM degree in 1986.  Since graduating in 1986 he has received the following educational certificates:  Lifelearn Certificate in Small Animal Dentistry 1994; Lifelearn Certificate in Feline Medicine, 1994; Canadian Course in Veterinary Homeopathy, 2000, leading to certification by the Academy of Veterinary Homeopathy.  On a personal note, Dr. Bissonnette owned and operated his own practice for thirteen years with his wife Dawn who is also a Veterinarian, before he became a partner with Pet Vet Hospitals. Dr. Dawn Bissonnette has recently finished a Certification course in Veterinary Acupuncture.  They live with their family of three cats, one dog and four horses.  Dawn rides one of their horses in Dressage competitions.  Dr. Bissonnette is interested in the area of alternative, therapies especially homeopathy and how it can be used in a complementary way with more traditional medicine, diagnostics and surgery. He is available here at Credit Valley for homeopathy referrals.  Dr. Bissonnette is also very interested in feline medicine and small animal surgery. 

Roselyn Allen, DVM

Associate Veterinarian

Dr. Allen graduated from Atlantic Veterinary College, Class of 2001 University of Prince Edward Island.  Dr. Allen’s academic career began with her obtaining a BA in English and a BSc in Biology from Dalhousie University in Halifax, Nova Scotia. After graduation Dr. Allen relocated to Ontario and spent the first part of her career working at our Eastside hospital in Stoney Creek.  She moved to Mississauga and became a full time Associate at our Credit Valley hospital after her son Maksim was born in 2003.  On a personal note; Dr. Allen is a proud Maritimer and returns there on her vacation time to visit with family and friends.  Her personal time is spent reading and watching movies, and of course keeping up with Max. Dr. Allen has a beautiful tortoiseshell cat named “Gilda”. She is affectionately known as Dr. Roz around the Pet Vet Hospital team!  Dr. Allen enjoys all aspects of companion animal medicine. She is passionately committed to the preservation of the human-animal bond and the solving of pet behavioural issues as they impact on that bond.  

Sheila Atmore , DVM

Associate Veterinarian

Dr. Atmore graduated from Ontario Veterinary College, University  of  Guelph in  1997.  After graduation Dr. Atmore accepted a position with Pet Vet Hospitals and spent time here at Credit Valley Pet Vet for her initial training. Once immersed in practice she spent her first year working at our Eastside hospital in Stoney Creek.  In 1998 we opened a new hospital in Oakville and Dr. Atmore was excited to accept a new challenge and was positioned there as the primary Doctor until May 31, 2001 when we sold the practice.  Dr. Atmore has been working on a full time basis here at Credit Valley since June 1, 2001.  On a personal note; Dr. Atmore enjoys country living on her farm.  Her hobby and passion is in the racing of horses. Most of her free time is taken up caring and working with the young horses, but she also finds time for two retired race horses.  On the farm, she is surrounded by her closest companion’s; her two cats, “Mr. Mackie” and Ms. Buckets” and her two canaries “Pip” and “Penny”. For relaxation she enjoys horseback riding and working in her greenhouse and garden.  Dr. Atmore enjoys all aspects of companion animal medicine and surgery.

Ryan Machowski, BSc., DVM
Associate Veterinarian

Dr. Ryan Machowski graduated from the University of Waterloo with his Bachelor of Science, Honours Health Studies in 2004.  Shortly after, he entered the Ontario Veterinary College and earned his Doctorate of Veterinary Medicine in 2010. Throughout his studies, Dr. Ryan worked in several small animal practices to gain experience and broaden his understanding of all facets of veterinary medicine.  Dr. Ryan is passionate about companion animal medicine with special interests in surgery and neurology.  

Dr. Ryan and his wife Melissa recently moved from Kitchener to Mississauga so that he can be close to the practice and check in on his patients as often as needed.  Dr. Ryan and Melissa live with their Pomeranian, Frankie, and two kitties, Martin and Lewis (or, as they refer to them, their little Rat Pack).  When not working, Dr. Ryan enjoys keeping active through cycling and running, playing the drums and piano and keeping abreast of the latest trends in veterinary medicine.

CLICK HERE to meet our Additional Veterinary Health Care Team