Käthi qualified 1983 at the university of Zurich, veterinary department. For more than 30 years she runs her own small animal practice. She is past president of the Swiss association for companion animals SVK and was in the board of the Swiss association of veterinarians GST. She is the Swiss director for FECAVA and WSAVA since 2011.
Käthi is active in the following FECAVA Working Groups and Committees:
- Working group on Animal Health and Welfare / Working group on Animal-Assisted Therapy and Welfare in Practice
- Working group Veterinary Mental Health and Well-being
- Marketing Committee
- Policy Committee
- Financial Advisory Committee