Where science and compassion cure
The Animal Endocrine Clinic: The world's foremost animal clinic for thyroid disorders in cats and dogs.

The Animal Endocrine Clinic is a state-of-the-art veterinary clinic headed by Dr. Mark E. Peterson. Dr. Peterson is a veterinarian who, over the last 40-plus years, has become renowned for advancing the world’s understanding of feline and canine endocrine (hormonal) disorders such as hyperthyroidism, hypothyroidism, Addison’s disease, Cushing’s syndrome, and diabetes.

Since 2012, Dr. Peterson has limited his practice to the diagnosis and treatment of thyroid disease in cats and dogs, with a primary focus on the proper treatment of feline hyperthyroidism with radioiodine (131I). Our goal is to carefully titrate and individualize each cat’s dose to as low as possible to still cure hyperthyroidism without inducing hypothyroidism. This low-dose approach also limits the radiation exposure to your cat, as well as to you and your family.

Advanced, comprehensive, compassionate
By specializing in the diagnosis and treatment of cats and dogs suffering from thyroid disease, the clinic’s highly qualified staff provides the most advanced, comprehensive medical care available.

In addition to offering the highest caliber of medical services available in the field, we also work very hard at making your time with us pleasant for both you and your pet. We do as much as we can to maximize your pet’s comfort level.

A beautiful, welcoming environment
We built our clinic to look like a warm, inviting home, rather than a sterile medical facility, so that cats feel at ease — and it works! Owners tell us that they’re amazed by how much more calm and cooperative their cats are here than at other clinics.

A mission of health and happiness
Our mission is to help cats (and dogs) with thyroid disorders live longer, healthier, and happier lives. Please feel free to contact us with any questions.

FAQ: All of your questions about hyperthyroidism answered.

21 West 100th St., New York, NY 10025
Phone: (212) 362-2650 • Fax: (212) 537-6340