| title | ISBN-13 (ISBN-10) | year of publica- tion | |
|---|---|---|---|
| Die unsichtbare Leine: Ein besserer Weg zum Verständnis Deines Hundes! | 978-3-924008-45-1 (3-924008-45-0) | 1988 | |
| The Body Language and Emotion of Dogs: A Practical Guide to the Physical and Behavioral Displays Owners and Dogs Exchange and How to Use Them to Create a Lasting Bond | 978-0-688-12841-8 (0-688-12841-6) | 1993 |