Excellent and Comprehensive Behavior Care Based on Your Cat's Feline Evolutionary Biology.

Schedule with Veterinarian and Oxford-trained Certified Cat Behaviorist and New York Times Acclaimed Feline Behavior Science Author on National Geographic

URINATION AND DEFECATION CASES MAY QUALIFY FOR A REDUCED CONSULT FEE FOR BEHAVIOR STUDY PARTICIPATION. Virtual Consultations by Video, Phone, or In-person. 274 Testimonials and Solved Feline Case Studies.


For Over Two Decades Solving Thousands of Cat Urination, Defecation, Marking and Aggression Issues in Over 30 Countries. The Clinic Scientifically Observes and Analyzes Cat Behavior from a Behavioral Cognitive, Ethological, and Feline Evolutionary Point of View.

OXFORD UNIVERSITY was Mieshelle Nagleschneider's most recent study of animal behavior. She is the founder of the first cat-only behavior clinic practice in the United States. Her other animal behavior studies include cat behavior specifically through the University of Edinburgh (Royal School of Veterinary Studies). You can learn more about her other animal studies including Harvard University on our Animal Behavior Study Page.

Mieshelle is a cat behaviorist for National Geographic television shows and published works and you can also watch her on the Today Show, Hallmark Channel, NBC Dateline, and MTV. Since 1999, her in-depth applied scientific analysis of the behavior and evolutionary biology of the cat has enabled her to help thousands of cat owners over two decades and in 30 different countries, solve their cat's behavior issues.

She is the award-winning international author of New York Times acclaimed feline behavior science book published in 4 languages by Random House Publishing and a long time cat behavior expert for National Geographic documentaries and published works on cat behavior and the 37 species of wildcats including the domestic cat and wildcat hybrids.

Mieshelle coined the term and was the first "Cat Behaviorist" and "Feline Behavioral Scientist" in the United States and is the recipient of the Golden Purr Award for her contribution to cat behavior. Our Veterinarian Dr. Jim Shultz performs local in-home consultations also.

To achieve behavior results that are lasting, it’s necessary to work with an experienced cat behaviorist, but most importantly, one with formal university study in animal behavior that can apply the sciences of gene-encoded behavior, animal psychology, feline evolutionary biology and physiology, to effectively correct a cat’s behavior.

Mieshelle travels the globe from Australia to the Philippines lecturing at the international level to veterinarians and shelter workers to help them better help cat owners for over two decades solving “unfixable” behavior issues. She goes beyond the obvious facts about cat behavior and offers intelligent and proven solutions. Cat owners receive systematic behavior plans and guidance based on feline evolutionary biology. She is world-renowned for her global leadership in cat behavior education and crossing the conventional boundaries of the cat behavior specialty.

Cats are still the most misunderstood companion animal that are at the greatest risk. The hundreds of vets that the clinic works with and who refer cats to us often say, as will vet behaviorists, "we still don't know what to do with cats". Dr. Jordan Carlton Schaul, Ph.D., contributing editor, National Geographic, and past curator, Orange County Zoo “The reason people are so mesmerized by house cats is because they are truly miniature versions of lions, tigers, and leopards. In her book, Mieshelle Nagelschneider explains the behavior of the house cat in an unprecedented and most accessible way, offering unique insight into the often misunderstood companion animal that is as wild as we have become civilized.”
READ ABOUT: Dr. Jim Shultz DVM and Mieshelle's Education, Acclaimed Feline Behaviorial Science Books, Lectures, Media, Spokesperson, and Welfarist International Work.

Hundreds of Cat Behaviorist Solved Case Studies and Testimonials Since 1999

  • Lexi has gone poop in the litter box 4 times in a row! This is the first poop that wasn’t covered in litter so I took a pic of it. She’s been doing very well this week!

    Cat Behavior Testimonial Mieshelle Kate M. Melbourne, Florida
  • I had a great experience working with Mieshelle solving our cat's urinating issues. She was clear and concise and most importantly solved an ongoing urination issue of several years within the first two weeks. I'm so glad that I worked with her and would definitely recommend her to anyone!

    Susan B. NYC
  • 2019 Urine Case Study Success Update: “Hello Mieshelle, Just wanted to follow up that Doolittle is now pee free for more than a month. He (behavior advice removed). The other cats (behavior advice removed) as you said no one was (behavior advice removed). From day one they stopped (behavior advice removed)”.

    Cat Behavior Testimonial Mieshelle Angela D. Bradenton, Florida

Cat Behaviorist Feline Issues Solved by the Clinic Throughout the United States. The Doctor and Cat Behaviorist are scheduling through November 15th

The Cat Behavior Clinic

The First Cats Exclusively Behavior Practice Serving California

Cat Behaviorist MieshelleCertified Cat Behaviorist Mieshelle Nagelschneider studied animal behavior at Oxford University and the University of Edinburgh – Royal School of Veterinary Studies, and is the author of the New York Times acclaimed feline behavior science book published in 4 languages by Random House Publishing. 

Founder and director of the clinic in 1999, her in-depth scientific analysis of the behavior and evolutionary biology of the cat has enabled her to help thousands of cat owners over two decades and in over 30 different countries, solve their cat’s behavior issues.

View 274 + solved case study reviews and client testimonials.  Recipient of the Golden Purr Award for her contribution to cat behavior, you can learn more about her other animal studies including her experience at Harvard University (here) that has enabled her to assess and effectively solve cat behavior issues.

Cat Behaviorist

Mieshelle’s award-winning first ever scholarly-cited cat behavior book (Random House Publishing) for cat owners published in 4 languages and across 80 countries (with co-writer Cameron Powell) acclaimed by The New York Times and is recommended text for a number of animal behavior certifying organizations. Read more about Mieshelle international cat advocate work and lectures conducted around the world on our cat behaviorist home page.

37 Wildcat Species Expert for National Geographic

You can also watch Mieshelle on National Geographic’s Animals Doing Things with Howie Mandel as their cat expert and other cat behavior documentaries by Nat Geo Wild.  As a cat behavior science author she is also the cat expert for many of National Geographic’s published works on the 37 species of wildcats, tigers, and every breed of the domestic house cat.

Originally from Los Angeles, Mieshelle is known for her global leadership in cat behavior education. Her passion and curiosity about cats along with her formal study in animal behavior, continues to put her on the forefront of cat behavior knowledge crossing the conventional boundaries of the cat behavior specialty.  Dr Shultz DVM performs in-home consultations locally only where he is licensed to practice and vet-to-vet remote consults.  Mieshelle performs consultations world-wide either remotely by phone or video or in-person in the Los Angeles area.

Read 274 Testimonials and Solved California Cat Behavior Case Studies Here.

Los Angeles Cat Behaviorist
Mieshelle Cat Expert and Spokesperson for Arm & Hammer Cat Litter with Co-host Susan Lucci on the Hallmark Channel.

What Our California Cat Owners Are Saying

2019 California Cat Behavior Testimonial Update: “I’m already having much success with (behavior plan removed) and all of her stools have been in the box since (behavior plan removed).  Should I send in a picture of a stool covered with litter? How should I handle getting a picture of her stool? I’ll send a photo of her (behavior plan removed) and an update on her behavior to the link. Thanks so much for all of your help.”  Ann H.  Costa Mesa, California 

Please contact the clinic to schedule a phone or video (Skype or Facetime) behavior consultation.  Please visit our home page to begin. Cat Behaviorist Mieshelle Nagelschneider goes beyond the obvious behavior strategies and facts during behavior consultation program.  She has lectured at the international level from Australia to the Philippines at education conventions for veterinarians, the Humane Society/SPCA on all common, but sometimes very complex, feline behavior issues.

“We didn’t know where to begin with our cat’s behavior issues, and the vets never seemed to know what to do either.  Our family is so glad we placed our complete trust in you and are forever grateful to have worked with you.  Thank you for saving our cat, Putters!  Steve R.  Santa Monica, California – Phone Consultation

For over two decades, California cat behaviorist Mieshelle Nagelschneider, has conducted several thousand cat behavior consultations in over thirty countries.

Cat behavior issues like urination, defecation, aggression and other cat behavior issues are very solvable. Taking into consideration feline evolutionary biology and your cat’s gene encoded behavior (instincts and fixed action patterns) is just one of several components that must be a part of a successful behavior plan that has lasting results.  To achieve this, it’s necessary to work with an experienced cat behaviorist, but most importantly, one with formal study in animal behavior that can apply the sciences of genetics, animal psychology, biology, physiology, learning and memory to effectively correct a cat’s behavior.

‘Queen” of the Cat Behavior Specialty, National and International Cat Welfarist, Lecturer, Behaviorist, and Award-winning Cat Behavior Science Author

Read more about Mieshelle’s national and international media, animal welfare and spokesperson work on the clinic about page. Watch Mieshelle with Howie Mandel on National Geographic’s Animals Doing Things and The Wild Side of Cats, the Today Show, Nat Geo Wild, Animal Planet, Hallmark Channel (and countless others) and her work with Best Friend’s Animal Society, the SPCA, and in Los Angeles for the NKLA (No-kill Los Angeles).

Call the clinic today to learn more or to schedule your consultation at 503-267-8888.

“Thanks for all Your Help Mieshelle!” Charlize Theron

Los Angeles Cat Behaviorist MieshelleWatch Los Angeles Cat Whisperer Mieshelle on the Today Show

Los Angeles Cat Whisperer

Mieshelle’s New York Times Acclaimed cat behavior science Book, The Cat Whisperer™ (Random House Publishing) is Best Selling on Amazon in Animal Psychology for Cat Behavior.

About Cat Behaviorist Mieshelle Nagelschneider in the Los Angeles, California News 

Please visit our clinic Home Page to Learn More and to Schedule.