Hello Alexandra Mastor,
I hope your dog is fine.
You have various possibilities to submit your documents to Allianz.
Via internet:
https://www.allianz.de/service/kontaktformular/
By post:
Allianz Versicherungs-AG
10900 Berlin
You can also contact your Allianz Agency. They like to support you. If you don`t have their contact details, please look hear:
https://www.allianz.de/agentursuche/
I hope I could help you.
kind regards
Lisa