Any questions regarding import and export to and from Germany can be answered by German Customs at their website or at their information centre:
Travelling with Pets
Information on the import procedures for pets can be found on the website of the Federal Ministry of Food and Agriculture
Travellers entering or leaving the European Union and carrying 10.000,- Euro or more in cash, its equivalent in other currencies, or easily convertible assets (e.g. traveller's cheques, bearer cheques and bonds) must declare the sum to customs.
The regulation is aimed at fighting money laundering, terrorism and crime, securing our safety and preventing cross-border crime.
Find information on how to declare here