You can change the language for the ECHO Dot (4th gen) with Amazon Alexa. Alexa supports multiple languages, including English and Spanish, but does not support German as a default option. However, there is no official support for German as the primary language for the Echo Dot. If you need a language other than English or Spanish, you should check if the desired language is available before purchasing, as the availability of languages and functions may vary by country and region.