Our caring and compassionate veterinary care team!

Meet the Veterinarians & Team of White Oaks Animal Hospital in Whitby! We’re pleased to provide exceptional vet care for your pets!

Please call us at (905) 444-9995 to speak to one of our caring veterinary staff members!


Dr. Shahid Nasir, DVM

Dr. Nasir received his DVM in 1997 and an MSc (Hons) in Veterinary Microbiology Degree in 2000. He received his VSTEP (Veterinary Skills Training and Enhancement Program) in 2007 from Ontario Veterinary College, University of Guelph, Ontario, Canada.  He practiced for 7 years in a mixed and exotic animal practice prior to his immigration to Canada in 2004.

Dr. Nasir began working in 2008 as a small animal and exotic veterinarian in Pembroke, Ontario. After 2 year in 2010, He moved to Whitby and Starts working in 24 Emergency Hospital in Peterborough Area. He has since developed a special interest in anesthesia, performing surgery, Medicine, Pocket pets, rabbit and birds and Other Exotics. In 2011 Dr. Nasir started his own practice in Whitby to serve the Whitby, Ajax, Oshawa and Durham region.

To further develop his base of knowledge, he attends at least one major international workshop or conference every year and also attends local veterinary meetings and seminars, he is a part of the Veterinary Information Network, subscribes to numerous journals, and networks extensively with other veterinarians.

Dr. Muhammad Dilawer, DVM

Dr. Muhammad Dilawer completed his Doctor of Veterinary Medicine Degree in 2007 and went on to finish his Master of Philosophy in small animal Surgery in 2010 with distinction. After practicing veterinary medicine for 5 years in small animal Clinics, Dr. Dilawer immigrated to Canada in 2013. He obtained his License to practice Veterinary Medicine in North America in 2017. Since then he is part of White Oaks Animal Hospital as a Veterinarian. His professional interests include Canine, Feline and Pocket Pets practice. Dr. Dilawer is married and has two sons. In his off time, he enjoys time with family, playing cricket, soccer and gardening.

Lesley Vanclief, Office Manager/Client Care Co-ordinator

Lesley graduated from Durham College as a Veterinary Assistant in 2006 and before that earned her Equine Diploma from The University of Guelph. Lesley has been with us since 2012 and enjoys meeting new clients and maintaining a close professional relationship with all of our existing clients and their fur babies. She shares her empathy and love for all animals when it comes to dealing with our clients and makes it her mission for you to leave the clinic knowing you have received the best care for your pet.

When not in the office, you can find Lesley at her farm with a plethora of four legged animals, which include her two dogs, five cats, a hedgehog and somewhere in there some fish, horses and a donkey! She has a passion for cooking, gardening, camping, horseback riding and kayaking, which she enjoys doing with her two children and her wife.

Courtney Collymore, Registered Veterinary Technician

As a recent graduate from Northern College, Courtney joined the White Oaks team in early2017. Courtney has had a love and passion for animals since she can remember. What she loves most about working with animals is seeing the strong bonds people have with their pets. In her down time, Courtney loves to spend time with family and friends traveling, exploring nature and trying fun, new activities. Courtney shares her home with her family and her two fur babies Bailey a Maltipoo and Niko, a Siberian Husky Mix.

Aleashia Humphries, Veterinary Assistant/Receptionist

Aleashia came to White Oaks in 2013 to gather hours to apply to Veterinary College. She volunteered every summer and we liked her so much, we asked her to become a team member in September 2017. Aleashia’s love of animals comes from always having a house full of fuzzy feet. Her family enjoys fostering animals that wouldn’t have been given a second chance. These fosters usually have a medical condition that requires constant care. Her current foster Milo has cerebellar hypoplasia. Aleashia enjoys spending time with her friends, playing sports, dancing and volunteering her time, when not helping us. We hope that Aleashia continues with her vet schooling and becomes a future veterinarian here at White Oaks.

Pam Weller, Veterinary Assistant

Pam joined the White Oaks team in December of 2017. She has worked in the animal field for the past 6 years and is completing her RVT at Sheridan College. Pam previously worked in small animal emergency and really enjoys the more uncommon surgical procedures we perform at White Oaks. When not at the clinic Pam enjoys playing with her German Shephard Kodiak, baking some of her infamous banana bread and watching horror movies. You can also find Pam on the field hitting homeruns.