Contact Us: (201) 262-0010
50+ years of service and experience combined with innovative medicine and compassionate care


It is upsetting to suspect or learn that your pet has cancer. The Oncology Service at Oradell Animal Hospital is here to support you. We understand your concerns and will support and guide you, your family and your pet you through this difficult time.

Our board certified oncologists will explain the biologic behavior of your pet’s cancer, diagnostic testing that would help with staging, potential treatment options (aggressive and palliative), and expected prognosis. Our team will individualize care and recommendations for each patient based on his or her diagnosis, overall health and quality of life, as well as family aims and goals.

Cancer therapy often requires multiple treatment modalities including: surgery, radiation therapy, chemotherapy, and/or immunotherapy. Our oncologists will collaborate with your primary care veterinarian, surgeon and radiation oncologist to provide a cohesive treatment plan.

With our expert staff and state-of-the-art chemotherapy suite, we administer a wide range of chemotherapy and immunotherapy treatments. We also provide supportive care and long-term monitoring, and have participated in several multi-institutional clinical trials.




Bone marrow aspiration


Diagnostic testing

Nutritional support



  Feline Sarcoma Vaccine​

  Melanoma Vaccine

  Canine Lymphoma Vaccine

Diseases We Treat

  • Lymphoma – Lymphosarcoma
  • Mast cell tumors and other skin tumors
  • Bladder tumors – Transitional Cell Carcinoma
  • Splenic tumors – Hemangiosarcoma
  • Bone tumors – Osteosarcoma
  • Leukemia
  • Soft tissue sarcomas
  • Vaccine-associated sarcomas
  • Mammary tumors
  • Intestinal tract tumors
  • Respiratory tract tumors
  • Histiocytic tumors

Warning Signs Of Cancer In Companion Animals

The American Veterinary Medical Association (AVMA) has developed a list of 10 warning signs of cancer in companion animals. Keep in mind that these signs can occur with diseases other than cancer.  If any of them are identified in your pet, it warrants further evaluation by your primary care veterinarian to rule out cancer as the underlying cause.​


  • Abnormal swellings that continue to grow
  • Bleeding or discharge from any body opening
  • Difficulty breathing, urinating or defecating
  • Difficulty eating or swallowing
  • Hesitance to exercise or loss of stamina
  • Loss of appetite
  • Offensive odor
  • Persistent lameness or stiffness
  • Sores that do not heal
  • Weight loss

Department Doctors

Dennis Bailey, DVM, Diplomate, ACVIM (Oncology)

Dr. Bailey received his DVM from Cornell University, completed an internship at North Carolina State University, and a residency in Oncology at Cornell University. He is a Diplomate of the ACVIM in Oncology, and he spent the last two years on the clinical faculty of the College of Veterinary Medicine, Cornell University. Dr. Bailey's professional interests include managing chemotherapy and pain management. He enjoys playing tennis and watching football. (Buffalo Bills). He has two cats, Laverne and Shirley.

Stephen Brenn, DVM, Diplomate, ACVIM (Oncology)

Dr. Brenn received his DVM degree from the College of Veterinary Medicine at North Carolina State University. He then completed an internship at the New Haven Central Hospital for Veterinary Medicine and remained in Connecticut to live and practice general medicine. He completed a three year residency in oncology at the Animal Medical Center in New York City. Dr. Brenn enjoys music, sports, and spending time with his two sons.

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