Schedule a Zoom or Phone Appointment by Calling the Clinic at 503-267-8888 or Schedule Online Through The Clinic Site. Thank you!

Recipient of the “Gold Purr Award” and the “2020 Business Award for Exemplary Businesses and People in the Field of Animal Behavior”.

Specializing in Cat Aggression, Urination, and Defecation Behavior Issues, The Doctor and Behaviorist Apply the Sciences of Wild Felid Genetics, Psychology, Biology, and Feline Learning and Memory to Effectively Solve Your Cat’s Behavior Issues Long Term.


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25 Years and More Cat Owners Purring Than Anyone in Over 30 Countries. View hundreds of testimonials and solved case studies.


STEP ONE:  Choose Your Feline Behavior Wellness Consultation Program

Important Update: We are currently scheduling Zoom and phone appointments with the doctor and behaviorist through June 30th.  For urination or defecation issues, participate in our feline study and receive the reduced consult fee through May 19th.  Scheduled cat owners can also participate in Mieshelle’s upcoming National Geographic cat behavior show production.

The Cat Behavior Clinic
Founders of the “Cat Behaviorist” Specialty Our Team Has More Cat Owners Purring Than Anyone From Switzerland to Los Angeles.

We Have Helped Thousands of Cat Owners in Over 30 Countries Solve Their Cat’s Urination, Defecation, Urine-marking, Aggression, and Vocalization Issues.

Founder of the the first cats exclusively behaviorist practice in the United States, Mieshelle Nagelschneider studied animal behavior at Oxford University and the University of Edinburgh Royal School of Veterinary Studies, and her animal behavior experience at Harvard University (read more here) has enabled her to help cat owners understand the science behind their cat’s behavior.  The first “Cat Behaviorist” in the U.S. and Canada, she is the award-winning international author of New York Times acclaimed feline behavior science book published in 4 languages by Random House Publishing.  Watch Mieshelle on Nat GeoWILD’s Animals Doing Things With Howie Mandel and as National Geographic cat behavior documentaries and published works long time cat behavior expert and researcher for the 37 species of wildcats (including your domestic house cat).