Watch Harvard Cat Behavior Expert Mieshelle Nagelschneider on The Today Show!

Mieshelle guest starred as the Cat Whisperer on Animal Planet's Must Love Cats!

Must Love Cats


You're Welcome, You're Welcome, You're Welcome!

i just wanted to say thank you, thank you. THANK YOU!!!

Georgia has stopped urinating on things! I've been (behavior advice removed) and (behavior advice removed) everyday. Thanks!

Mariko B., Kent, WA 2007

A Vet Says, Every Wine In Its Own Time

Chardonnay is no longer urinating on our couch and bed. It has been 3 weeks and no accidents! Thanks you! I really think it was the (behavior advice removed). Our...

Best, Marci and Sigmund W., New York, NY 2005

You DON'T Have to Give Up Your Cats -- Not Even Bengals

Thank you Mieshelle for helping us solve the behavior problem with...

Steve and Diane, Miami, Fl 2002

Think you’ve tried everything?  Are you at your wit’s end?

You can contact the clinic at 503-267-8888 to schedule a phone or video Skype consultation with our Harvard-trained, Certified Cat Behaviorist, and international behavior author, Mieshelle Nagelschneider, The Cat Whisperer®.  

Certified Cat Behavior Expert Mieshelle Nagelschneider, has traveled the globe as a cat behavior welfarist (read 173 testimonials of cats’ lives she’s changed) and international cat behavior lecturer to Australia, Philippines, Canada, Costa Rica, Panama, Switzerland, France, Italy, Spain, and the UK.  and as a major cat brand spokesperson nationally and internationally.  She has been the guest lecturer for international Humane Society and SPCA behavior conventions.  She has educated hundreds of veterinarians, shelter workers, and cat owners on behavior issues in cats around the world since 1999.  Her science-based cat behavior book has been featured in the New York Times and a best-seller on Amazon. and published in 4 languages (Random House Publishing).


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Mieshelle is the recipient of the Golden Purr Award, contributing complete cat behavior knowledge and seen in the New York Times, The TODAY SHOW, Nat Geo WILD, National Geographic, ANIMAL PLANET, NBC Dateline, Arm & Hammer, Animal Rescue Site, Free Kibble Kat,, Martha Stewart Radio, WHISKAS, USA Today, Real Simple Magazine, Cat Fancy Magazine, Feline Wellness Magazine, Advisory Council, This Wild Life, Divine Cat, The Cat Channel, Pets Magazine, The Circle, New Republic, The Sunrise Show,, Herald Sun, Toronto Star, Globe and Mail, and T.V. show House.

Cat behaviorist Mieshelle-Nagelschneider Our Cat Behaviorists


Millions of cats are euthanized each year for natural cat behaviors the owners have deemed problematic. Mieshelle Nagelschneider, Harvard-trained, C.A.T. Counselor with the Certified C.A.T. Behavior Counselors, behavior author, and is known for her global leadership in cat behavior education since 1999.  Her passion and curiosity about cats along with her formal study in animal behavior, continues to put her at the forefront of cat behavior knowledge crossing the conventional boundaries of the cat behavior specialty.

“The reason people are so mesmerized by house cats is because they are truly miniature versions of lions, tigers, and leopards. Mieshelle explains in an unprecedented and a most accessible way, the behavior of the house cat, with her unique insight into the often misunderstood companion animal that is as wild as we have become civilized.” Dr. Jordan Carlton Schaul, PhD — Contributing Editor, National Geographic Society and Curator, Orange County Zoo

“Over the course of many years, Mieshelle has developed and refined her unique ability to think like a cat.  On numerous occasions I have witnessed the life-changing benefits Mieshelle’s techniques can bring to cats and their sometimes very frustrated owners.” Dr. James R. Schultz  DVM

“I wish I read The Cat Whisperer book before I started filming Must Love Cats. The cats would have liked me a lot more.” From John Fulton – Animal Planet’s Must Love Cats

Working with a behaviorist that has formal education in animal behavior is a vital component in solving any cat behavior issue.  Without a behavior plan that is carefully created drawing from current research on cat behavior to appropriately address all the critical components and factors of a presenting behavior, is like trying to conduct a symphony without sight or sound.  At The Cat Behavior Clinic we practice responsible and ethical behavior care for cats, have a licensed veterinarian and also a cat behaviorist C.A.T. Counselor that also has formal study in cat behavior.

Mieshelle and Dr. Jim Shultz can solve your cat’s behavior issues with a behavior plan designed for your cat(s) that include the latest scientific research and advanced techniques (found only here) that have helped thousands of cats and their owners.   Litter box elimination issues, urine marking, excessive meowing, inter-cat social and aggression issues, are her specialty.  Mieshelle has formal study in animal behavior, conducted cat behavior studies, and has authored a science-based and the first scholarly cited cat behavior book with the latest strategies to help cats.  Her passion for science and pushing the boundary of the cat behavior specialty has enabled her to offer cutting edge advice that goes beyond the obvious facts that are commonly found elsewhere.  Mieshelle is also known for solving behavior issues that are deemed “unfixable”.

Mieshelle who is currently the spokesperson for Arm & Hammer Cat Litter, has been featured on The Today Show as the Cat Whisperer ®, National Geographic, NBC Dateline, Animal Planet, National Geographic Radio, Martha Stewart Radio, and Cat Crazy Radio (she is the co-host) and as the International Cat Behavior Expert for Whiskas and welfarist for cats in the Philippines at The International Cat Association as The Cat Whisperer®.  Mieshelle has also worked directly with Best Friend’s Animal Society and Stray Cat Alliance in L.A. as a welfarist for cats and as their guest, The Cat Whisperer® where she spoke to cat owners on behavior issues.

Her behavior expertise has been seen in the New York Times, Modern Cat Magazine, Cat Fancy Magazine, The New York Post,  USA Today, This Wild Life, The Divine Cat, Real Simple Magazine,, Petside, Freekibblekat, Washingtonian, The Toronto Star, Canada Globe and Mail, Animal Rescue Site, New Republic, The Daily Cat, and countless others.  She also has her own cat behavior column in the Animal Rescue Site and Pet360 where she is also serves on the Feline Advisory Board.  See our Media Room for the latest.

Mieshelle is a long time member of the Animal Behavior Society, and Professional member of the Association of Animal Behavior Professionals.  She has studied cat behavior for decades, and she continually keeps abreast of and takes part in observational and controlled studies on cats which has enabled her to provide behavior plans and techniques that other behavior experts are unable to replicate and provide for their clients. Mieshelle has arguably logged more hours helping cat owners solve behavior issues than any other animal behaviorist or veterinarian in the world along with an unrivaled number of testimonials since 1999. More testimonials

She is referred by and worked with veterinarians, cat shelters, and even wild-cat sanctuaries from England to North America to Australasia.  She has recently toured the globe as the International Cat Behavior Expert for Whiskas along with the Animal Welfare League to help elevate the status of the cat and educate cat owners about cat behavior.  She has also performed much needed cat studies for Hammacher Schlemmer on advanced litter box technologies and perching and resting areas for cats.

She has worked with thousands of cat owners and vets, and among the clients who follow her advice, including her proprietary C.A.T. Plan®, her success rate is 90% or better. Read our clients’ success stories and see why the Clinic is your best chance of stopping all behavior problems now and future ones from occurring (very important!). You can also read Mieshelle’s charming story of how she became a lover and observer of animals, nearly 40 years ago, in her Life Among the Animals (excerpt from her cat behavior book — Random House Publishing).

One very crucial component in treating some cat behavior issues is ongoing help after the initial consultation.  Because appropriate and sound behavior advice for a specific cat is not one-size-fits-all, continued correspondence with your behaviorist is possible at The Cat Behavior Clinic.

Mieshelle is a popular resource for many cat-only veterinary practices nationwide, many wild cat sanctuaries, and countless animal shelters needing expert advice on feline behavior, which she usually donates her time to. Mieshelle has worked professionally with thousands of domestic house cats, wild, and feral cats. She was one of the referred Feline Behavior Consultants for Animal Aid and The Cat Adoption Team of Oregon, a 350-cat no-kill shelter, many medical vets nationwide, and is a Guardian Angel for cats with emotional and physical needs at Best Friends Animal Sanctuary.

Mieshelle worked side-by-side with veterinarians for many years, and has spent 20 years working professionally with cats of all kinds — from domestic cats to large exotics of the tiger family.  Mieshelle started her career as a veterinary technician and psychology major. “I have been caring for animals since I began to walk,” she says, “dogs, cats, horses, birds — and have cared for them professionally since 1989, when I was a vet assistant.   Before long, I realized cat owners are under-served and I began to focus my work exclusively on cat care — which sometimes means care of their owners too.

Mieshelle lives in the Pacific Northwest with 11  animals, including seven cats (Jasper Moo Foo, Rhapsody in Blue, Clawde, Barthelme, Lady Josephine, Farsi Noir, and Brahmwell), a Savannah Monitor, the cats’ bird friend Pidgeoto, their dog-toy Piccolo (a Teacup Chihuahua), and the cats’ personal horse and beast of burden, a soulful Great Dane named Jazzy.

Oh, and Nagelschneider is her real name — it’s German for “nail clipper,” and we’re not making that up. She is known for her “uncanny” ability to trim some of the most difficult cats’ nails and help their owners do the same.  she is also and active supporter of the new anti-declaw film, The Paw Project, by veterinarian Jenny Conrad.  She just testified along with The Paw Project team on the anti-declaw bill at the state capitol in 2015 to end cat declawing.

Featured in The New York Times and a best-seller on Amazon, Mieshelle’s breakthrough science-based book on her C.A.T. Plan system for solving and even preventing all feline behavior problems, The Cat Whisperer (Random House Publishing with co-author Cameron Powell), is available online or in bookstores now!

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2005– Mieshelle with Lynn Hoover, President of the International Association of Animal Behavior Consultants

Recent STUDY:

  • Harvard University –  2007 study in animal cognition toward citation
  • Current social facilitation study and domestic felines — 2007 – PRESENT
  • Perching and resting areas of the domestic feline 2009
  • Advanced litter box technologies and usage of the domestic feline 2008