Veterinary Oncology

A cancer diagnosis of a pet changes you forever. The Oncology Department at Animal Medical Center of Seattle works with you to provide not only compassionate care but a wide array of advanced and effective treatment options. We will work with you and your pet and tailor each treatment protocol to allow effective cancer treatment, while minimizing major side effects.

Mary Davis, DVM, DACVIM (Oncology)

Mary Davis, DVM, DACVIM (Oncology)

Dr. Mary Davis, DVM, DACVIM grew up in central Texas along the Guadalupe River. After graduating from Texas A & M College of Veterinary Medicine, her adventures took her to California where she completed a small animal medical and surgical internship at Coast Animal Hospital and Animal Cancer Center in Hermosa Beach. For the next few years, her interests focused on emergency medicine, which she practiced in California and South Carolina. In 2000, she and her husband settled back in Southern California. It was then she realized that many of the older patients she was treating in her emergency duties were often diagnosed with cancer. This inspired her to pursue a medical oncology residency which she completed in 2006 at Veterinary Cancer Group in Tustin, California. She became board certified in medical oncology in 2011.

This chapter in her life has taken her to the beautiful Pacific Northwest and the Animal Medical Center of Seattle. Her primary interests include helping her patients and their families through the journey of cancer therapy, focusing on the quality of life of all involved. Dr. Davis understands a pet diagnosed with cancer can be a challenging time for the families involved. She likes to spend the time to present options, determine what the family feels is important, and guide in making treatment decisions. The primary focus of any cancer treatment is maintaining a good quality of life for all involved (patient and family), and she wants the family to feel comfortable with the decision they have made. Some of Dr. Davis’ interests include low dose metronomic chemotherapy and therapy with drugs called “small molecule inhibitors.” She feels the treatment should never be worse than the disease.

She shares her home with her husband Steve, their dog Kalik, and “foster” dog, Lily (now in the family for 2+ years!). When she’s not working, she enjoys travel adventures and loves anything that takes her outside such as cycling, paddling, and hiking.

Brittany Evans, DVM, MS, DACVIM (Oncology)

Brittany Evans, DVM, MS, DACVIM (Oncology)

Dr. Brittany Evans is originally from a suburb of Philadelphia and found her passion for veterinary medicine at a very young age, when she began volunteering at her local animal shelter. She graduated from Gettysburg College in Pennsylvania earning a Bachelor of Science in Biology in 2010. Dr. Evans then began her veterinary education at St. George’s University in the British West Indies, before transferring and earning her Doctorate of Veterinary Medicine from Oklahoma State University in 2015. It was during her clinical year of veterinary school that Dr. Evans developed a passion for medical oncology. She completed a small animal rotating internship at the University of Missouri in 2016 and a specialty oncology internship at the University of Pennsylvania in 2017. Dr. Evans then relocated to the “other OSU,” The Ohio State University, where she completed a three-year medical oncology residency and earned a Master of Science in Comparative and Veterinary Medicine in 2020. She achieved board certification in small animal medical oncology in 2021.

Dr. Evans’s research interests including canine and feline lymphoma and histiocytic sarcoma. Dr. Evans is a member of the Veterinary Cancer Society (VCS), American Veterinary Medical Association (AVMA) as well as the American College of Veterinary Internal Medicine (ACVIM).

Having a pet diagnosed with cancer is a difficult time for clients and their families. Dr. Evans strives to provide the pet owner with all potential diagnostic and treatment options available to their pet, from multimodal cancer therapy to palliative care. A patient’s quality of life is the most important aspect of guiding therapy, and she will help provide clients with information necessary to make the best possible treatment decisions for the pet and the client.

Dr. Evans recently moved to the Seattle area, which has been a dream of hers since visiting in 2014. In her spare time, she is exploring her new city of Seattle with her two dogs, Yoshi and Charlotte and her ragdoll cat Tristan.


Services Provided


Novel therapies
Advanced Imaging
Surgical consultations
Radiation referrals
Pet loss therapy referrals

Please contact our Oncology Department for more information or questions about these services.

In addition, we are excited to partner with Dr. Tanya Donovan to offer the following interventional radiology procedures for our cancer patients:

  • Stenting of the urethra, esophagus, colon and trachea to relieve obstructions by tumors
  • Laser ablation of early transitional cell carcinoma of the bladder
  • Chemoembolization for liver, bladder, and prostate tumors
  • Embolization of nasal vessels to control epistaxis from nasal tumors

Types of Cases


Cancers (Malignancies) Based on Location
Adrenal and Pituitary Tumors
Bladder and Urethral Tumors
Bone Tumors (primary and metastatic)
Brain and Spinal Cord Tumors
Cardiac and Heart-based Tumors
Esophageal Tumors
Gall Bladder, Liver, and Pancreatic Tumors
Laryngeal and Tracheal Tumors
Lung Tumors (primary and metastatic)
Mammary Gland Tumors
Mediastinal Tumors
Nasal Tumors
Ocular and Periocular Tumors
Oral and Salivary Gland Tumors
Perianal and Anal Sac Tumors
Prostatic Tumors
Renal Tumors
Reproductive Tumors (male and female)
Rib and Pleural Tumors
Skin, Nail Bed, and Foot Pad Tumors
Skull Tumors
Splenic Tumors
Thyroid and Parathyroid Tumors
Stomach and Intestinal Tumors

Specific Types of Cancer (Malignancies)
Apocrine Gland Adenocarcinoma
Basal Cell Carcinoma
Histiocytic Disease
Leukemia and Lymphoma
Mast Cell Tumor
Multiple Myeloma
Other – Adenocarcinoma, Carcinoma, Sarcoma, Undifferentiated
Soft Tissue Sarcoma
Squamous Cell Carcinoma
Transitional Cell Carcinoma


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17518 15th Ave NE
Shoreline, WA 98155
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Contact Us

Call: 206-204-3366
Fax: 206-204-3858