Meet Our Team

Our Staff is dedicated to finding the best match between your horse's particular needs and veterinary medicine's limitless possibilities.

Kath Mertens, DVM—Veterinarian; Practice Owner

Dr. Mertens earned her DVM from the Purdue University School of Veterinary Medicine in 2000, and also holds a degree in English from Harvard.

Kath's interest in horses has taken her across the ocean and the continent, working at internships in Ireland and France and hitting the trails in Long Island, NY; Wyoming, Montana, and now Oregon.   She is a dedicated student of the horse and enjoys studying equines from both a medical and horsemanship perspective. Her primary riding interests are back-country trail riding, three day eventing, and dressage.

Kath enjoys leisure time with her son and their black Labrador, Makai, and a recently adopted cat. She also enjoys training her 10 yro OTTB mare, Luna; reading, writing, long-distance running, and yoga.

Makai--Vet Dog

Many clients are delighted to see that lab work is available wherever Dr. Mertens might travel--expert endorsed Black Labrador Work, that is.  (We also provide the other kind.)

Rest assured that she will not exit the vehicle at your farm unless she has your permission!

Makai, age 10, is trained to stay right where she's pictured: perched and waiting to give love and tail wags to any approaching friends from the barn.  In our newest rig, she's usually found in the cab of the pick up, but her moral support functions remain unchanged.

She has been Vet Dog since the age of 8 weeks and considers it a career goal.


Find us on the map

Office Hours

Our Regular Schedule


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


9:00 am-2:00 pm




Read What Our Clients Say

  • "Kath, thank you so much for being Greyson's vet, your gentle hand, compassion and great skill made all the difference for my buddy."
    --Deirdre Dekking, Portland
  • "Dr. Mertens is a very friendly, knowledgeable equine veterinarian (and a friend to the rest of the farmyard, including the chickens!). Always up to date on the latest in equine health, and even though Mertens Mammals is a small clinic giving you the personable experience, Dr. Mertens also has equipment for more advanced diagnostics and procedures!"
    —Ari Gordon, Boring
  • "I have been a client of Mertens Mammals for 10 years. Kath (Dr. Mertens) is the most kind, thoughtful and caring Vet I have ever had for my animals. I have 3 horses: my Appy "Breeze" who turns 30 this year, my Paint " Rocket " 14 and my other Paint "Fergie " 3 are all under Kath's care. I also had a dog "Cowboy" who I lost to cancer last July. Kath took care of him also. Dr.Mertens came out on Mother's Day about 7 years ago to treat Breeze for a cut above her right eye. After a few weeks of recovery we were happy to not have a huge scar. Kath also spent 2 hours with me 3 years ago when Rocket had a small case of colic. (Thank God). I couldn't ask for a better person to take care of my girls. Kath always calls to check in on the patients. When people ask who I use for my veterinary needs for my horses, I'm always proud to refer them to Mertens Mammals. I am so thankful for an honest and caring Vet. Thank you, Kath!"
    --Michelle Schatz, Portland
  • "I got looking at Sassy’s records and it will be 6 years in July when you first met Sassy—I feel so fortunate that you became her vet and have looked after her all these years. You are such a wonderful and caring doc and I know you always have Sassy’s best interests at heart. I also know I can always rely on you to help me or Sassy when needed. Thanks for all you do for both of us—will keep you posted on Sassy.”"
    —Judy Becker, Eagle Creek
  • "My horse, Pester, would have lost her eye had it not been for the great care and dedication by Mertens Mammals. They are truly there for you any time you need them. I could go on and on. Kath Mertens has been so good to us!"
    --Troy and Wendy Mohr, Estacada
  • "She has always been there for us. She is forever in my thoughts as the best vet. She saved our hours old filly from certain death. She knew exactly what to do in an instant after just seconds in seeing her. We are forever in your debt...thank you!"
    Barbara T.
  • "Thank you Dr Mertens for such a thoughtful and careful job with our sweet Daisy the Donkey this morning! She is well on her way to health again after that abscess!"
    Suzi C.