19203 Aurora Ave N
Shoreline, WA 98133
(206) 546-1243


5506 Pacific Avenue
Tacoma, WA 98408
(253) 471-9200

  • Restoring Health & Happiness to Senior Cats Since 1992

Offering the safest, most reliable treatment for Feline Hyperthyroidism

Hyperthyroidism is the most common hormonal disease of cats resulting from excess thyroid hormone, which puts significant and potentially fatal stresses on the body. Radioiodine therapy is the safest and most effective therapy available. It's less risky than surgery and doesn't require medicating your cat daily for years. Most cats stay a couple nights before returning home — happy and healthy.

Meet Our Doctors

Dr. Dennis Wackerbarth

Dr. Dennis Wackerbarth

Dr. Wackerbarth is the medical director and founder of both the Feline Hyperthyroid Treatment Center and Cats Exclusive Veterinary Center. A graduate of Washington State University College of Veterinary Medicine in 1977, Dr. Wackerbarth is well known for his visionary contributions to feline medicine in the Northwest. Read More »

Dr. Faythe Vaughan

Dr. Faythe Vaughan

Dr. Faythe Vaughan began working with Dr. Wackerbarth in the Feline Hyperthyroid Treatment Center in 2002 and today devotes most of her clinical time to treating hyperthyroid patients. Dr. Vaughan graduated from Auburn School of Veterinary Medicine in 1985. After completing an internship at Washington State University in 1987, she moved to Seattle where she began working in a mixed veterinary practice. Read More »


We want to thank you for your extraordinary efforts in looking after our Samson's well being. You took the initiative of a problem we were not aware was even present. We are very, very grateful to all involved in Samson's case. We appreciate the detailed... read more »

Port Townsend, WA

As a member of an animal rescue organization on Vashon Island (VIPP), as well as being a chronic cat owner, I've had many opportunities to visit the Feline Hyperthyroid Treatment Center. Over the past 30+ years, I've taken scores of cats to Shoreline for definitive... read more »

Vashon Island Pet Protectors
Vashon Island

Monty is 12 years old. Dr. Vaughan had been monitoring Monty’s thyroid over the years and identified that he was borderline for hyperthyroidism.  After discussing his overall appearance, behavior and appetite, we decided that it made sense to treat him.  We were so relieved to... read more »


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