White Marsh Animal Hospital - Our Doctors

Dr. Susan Brennan

Susan H Brennan DVM

Dr Susan Brennan is a Maryland native. As a small child she was always fascinated by animals and at a young age decided to pursue veterinary medicine. She graduated from Virginia Tech with a BS in Biology and subsequently graduated from VA-MD Regional College of Veterinary Medicine- Go Hokies!!! Following graduation she spent several years as an associate vet prior to owning a successful small animal practice in Glen Burnie.

Following the sale of her practice she worked as a relief veterinarian in several practices and as well as with humane organizations. Although she enjoyed this work she longed to be a practice owner again. When White Marsh Animal Hospital became available she knew it was the perfect fit. She brings with her over 20 years of experience as a clinician and owner. Her interests include preventative medicine, internal medicine, as well as soft tissue surgery.

Dr Brennan looks forward to meeting you and your pets. She hopes to continue the wonderful legacy of Dr Bonnie.

Dr. Ellen Harrison

Ellen Harrison DVM

Dr. Harrison is a graduate of the University of Minnesota. Veterinary medicine is her second career- she spent the 10 years prior to becoming a veterinarian as a histotechnologist, working in both hospitals and in research, and teaching students at the Hospital of the University of Pennsylvania. She enjoys caring for her six indoor cats, who are spoiled rotten. Working with dogs and cats and helping owners keep their pets healthy is her passion. She can’t wait to meet yours!

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White Marsh Animal Hospital


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8:00 am-7:00 pm


8:00 am-6:00 pm


8:00 am-2:00 pm